(x+4)*(x+4)=x*x+160
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![(x+4)*(x+4)=x*x+160](/uploads/image/z/10219135-31-5.jpg?t=%28x%2B4%29%2A%28x%2B4%29%3Dx%2Ax%2B160)
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(x+4)*(x+4)=x*x+160
(x+4)*(x+4)=x*x+160
(x+4)*(x+4)=x*x+160
(x+4)*(x+4)=x*x+8x+16x*x+8x+16=x*x+8x+16此式为恒等式
(x+4)*(x+4)=x*x+160
一个“整式的乘法”的问题请先阅读下列解题过程,再仿做下面的问题.已知X*X + X - 1=0,求X*X*X + 2*X*X + 3的值.解X*X*X + 2X*X +3=X*X*X +X*X -X +X*X +X +3=X{X*X +X -1} +X*X +X -1 +4=0+0+4=4+ x + X*X + X*X*X=0.+ X*X + X*X*X
*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
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