1.(a-2b+c)² 2.(x²-2x)²+2(x²-2x)+1
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1.(a-2b+c)²2.(x²-2x)²+2(x²-2x)+11.(a-2b+c)²2.(x²-2x)²+2(x²-2
1.(a-2b+c)² 2.(x²-2x)²+2(x²-2x)+1
1.(a-2b+c)² 2.(x²-2x)²+2(x²-2x)+1
1.(a-2b+c)² 2.(x²-2x)²+2(x²-2x)+1
(a-2b+c)²
=[(a-2b)+c]²
=(a-2b)²+2c(a-2b)+c²
=a²-4ab+4b²+2ac-4bc+c²
(x²-2x)²+2(x²-2x)+1
=[(x²-2x)+1]²
=(x²-2x+1)²
=[(x-1)²]²
=(x-1)的4次方
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计算1.(a-2b+c)²
2.(x²-2x)²+2(x²-2x)+1
解1.(a-2b+c)² =[(a-2b)+c]²
=(a-2b)²+2c(a-2b)+c²
=a²-4ab+4b²+2ac-4bc+c²
=a²-4b²+...
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计算1.(a-2b+c)²
2.(x²-2x)²+2(x²-2x)+1
解1.(a-2b+c)² =[(a-2b)+c]²
=(a-2b)²+2c(a-2b)+c²
=a²-4ab+4b²+2ac-4bc+c²
=a²-4b²+c²-4ab+2ac-4bc
2.(x²-2x)²+2(x²-2x)+1
=x⁴-4x³+4x²+2x²-4x+1
=x⁴-4x³+6x²-4x+1
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