[从头学数学] 第135节 整式的乘法与因式分解 小结与复习题

剧情提要：
[机器小伟]在[工程师阿伟]的陪同下进入了筑基中期的修炼，
这次要修炼的目标是[整式的乘法与因式分解 小结与复习题]。

正剧开始：

星历2016年03月12日 15:54:49, 银河系厄尔斯星球中华帝国江南行省。
[工程师阿伟]正在和[机器小伟]一起研究[整式的乘法与因式分解 小结与复习题]。

<span style="font-size:18px;">//1(1)var s = [  '(-2x^[2]y^[3])^[2]*(xy)^[3]','=4x^[7]y^[9]'];//1(2)var s = [  '(2a+3b)(2a-b)',//'=4aa+6ba-2ab-3bb'//4a2+4ab-3b2'=4a^[2]-4ab-3b^[2]'];//1(3)var s = [  '5x^[2](x+1)(x-1)','=5x^[2](x^[2]-1)','=5x^[4]-5x^[2]'];//1(4)var s = [  '(2x+y-1)^[2]','=4x^[2]+y^[2]+4xy-4x-2y+1'];//1(5)var s = [  '59.8*60.2','=60*60-0.2*0.2','=3599.96'];//1(6)var s = [  '198^[2]','=(200-2)^[2]','=40000-800+4','39204'];</span>

<span style="font-size:18px;">function myDraw(xGlobal, yGlobal) {  var config = new PlotConfiguration();      config.init();  config.setPreference();  var r = 15;config.setSector(1,1,1,1);  //config.graphPaper2D(0, 0, r);//config.axis2D(0, 0,180);  //2(1)var s = [  '(2a)^[3]*b^[4]/12a^[3]b^[2]','=1/6b^[2]'];//2(2)var s2 = ['(-2/3a^[7]b^[5])/(3/2a^[2]b^[5])','=-4/9a^[5]'];//2(3)var s3 = ['6/5a^[3]x^[4]-0.9ax^[3])/(3/5ax^[3])','=2a^[2]x-1.5'];//2(4)var s4 = ['(7x^[2]y^[3]-8x^[3]y^[2]z)/8x^[2]y^[2]','=7/8y-xz'];var x = -120, y = 20;var mathText = new MathText();config.setSector(2,2,1,1); for (var i = 0; i < s.length; i++) {mathText.print(s[i], x, y);y += 50;}x = -120, y = 20;config.setSector(2,2,1,2); for (var i = 0; i < s.length; i++) {mathText.print(s2[i], x, y);y += 50;}x = -120, y = 20;config.setSector(2,2,2, 1); for (var i = 0; i < s.length; i++) {mathText.print(s3[i], x, y);y += 50;}x = -120, y = 20;config.setSector(2,2,2,2); for (var i = 0; i < s.length; i++) {mathText.print(s4[i], x, y);y += 50;}}</span>

<span style="font-size:18px;">function myDraw(xGlobal, yGlobal) {  var config = new PlotConfiguration();      config.init();  config.setPreference();  var r = 15;config.setSector(1,1,1,1);  //config.graphPaper2D(0, 0, r);//config.axis2D(0, 0,180);  //3(1)var s = [  '25x^[2]-16y^[2]','=(5x+4y)(5x-4y)'];//3(2)var s2 = ['(a-b)(x-y)-(b-a)(x+y)','=2x(a-b)'];//3(3)var s3 = ['a^[2]-4ab+4b^[2]','=(a-2b)^[2]'];//3(4)var s4 = ['4+12(x-y)+9(x-y)^[2]','=(2+3(x-y))^[2]'];var x = -120, y = 20;var mathText = new MathText();config.setSector(2,2,1,1); for (var i = 0; i < s.length; i++) {mathText.print(s[i], x, y);y += 50;}x = -120, y = 20;config.setSector(2,2,1,2); for (var i = 0; i < s.length; i++) {mathText.print(s2[i], x, y);y += 50;}x = -120, y = 20;config.setSector(2,2,2, 1); for (var i = 0; i < s.length; i++) {mathText.print(s3[i], x, y);y += 50;}x = -120, y = 20;config.setSector(2,2,2,2); for (var i = 0; i < s.length; i++) {mathText.print(s4[i], x, y);y += 50;}}</span>

<span style="font-size:18px;">>>> print('{0:.2e}'.format(9.6*10e6*1.3*10e5));1.25e+14</span>

<span style="font-size:18px;">function myDraw(xGlobal, yGlobal) {  var config = new PlotConfiguration();      config.init();  config.setPreference();  var r = 15;config.setSector(1,1,1,1);  //config.graphPaper2D(0, 0, r);//config.axis2D(0, 0,180);  //6(1)var s = [  '4(x+1)^[2]-(2x+5)(2x-5)',//'=4x2+8x+4-4x2+25''=8x+29'];//6(2)var s2 = ['2x(1/2x^[2]-1)-3x(1/3x^[2]+2/3)',//'=x3-2x-x3-2x''=-4x'];//6(3)var s3 = ['3(y-z)^[2]-(2y+z)(-z+2y)',//'=3y2+3z2-6yz-4y2+z2'//-y2+4z2-6yz'=-y^[2]+4z^[2]-6yz'];//6(4)var s4 = ['[x(x^[2]y^[2]-xy)-y(x^[2]-x^[3]y)]/3x^[2]y',//'(x3y2-x2y-yx2+x3y2)/3x2y''=2/3xy-2/3'];var x = -120, y = 20;var mathText = new MathText();config.setSector(2,2,1,1); for (var i = 0; i < s.length; i++) {mathText.print(s[i], x, y);y += 50;}x = -120, y = 20;config.setSector(2,2,1,2); for (var i = 0; i < s.length; i++) {mathText.print(s2[i], x, y);y += 50;}x = -120, y = 20;config.setSector(2,2,2, 1); for (var i = 0; i < s.length; i++) {mathText.print(s3[i], x, y);y += 50;}x = -150, y = 20;config.setSector(2,2,2,2); for (var i = 0; i < s.length; i++) {mathText.print(s4[i], x, y);y += 50;}}</span>

<span style="font-size:18px;">function myDraw(xGlobal, yGlobal) {  var config = new PlotConfiguration();      config.init();  config.setPreference();  var r = 15;config.setSector(1,1,1,1);  //config.graphPaper2D(0, 0, r);//config.axis2D(0, 0,180);  //7(1)var s = [  'x^[3]-9x','=x(x+3)(x-3)'];//7(2)var s2 = ['16x^[4]-1','=(4x^[2]+1)(2x+1)(2x-1)'];//6(3)var s3 = ['6xy^[2]-9x^[2]y-y^[3]','=-y(3x+y)^[2]'];//6(4)var s4 = ['(2a-b)^[2]+8ab','=(2a+b)^[2]'];var x = -120, y = 20;var mathText = new MathText();config.setSector(2,2,1,1); for (var i = 0; i < s.length; i++) {mathText.print(s[i], x, y);y += 50;}x = -120, y = 20;config.setSector(2,2,1,2); for (var i = 0; i < s.length; i++) {mathText.print(s2[i], x, y);y += 50;}x = -120, y = 20;config.setSector(2,2,2, 1); for (var i = 0; i < s.length; i++) {mathText.print(s3[i], x, y);y += 50;}x = -120, y = 20;config.setSector(2,2,2,2); for (var i = 0; i < s.length; i++) {mathText.print(s4[i], x, y);y += 50;}}</span>

<span style="font-size:18px;">>>> W = lambda D, d, h : 3.14*(D*D-d*d)/4*h;>>> W(1, 0.4, 18)*4*7.8370.31904</span>

本节到此结束，欲知后事如何，请看下回分解。