已知A=2x+x的平方,b=x-2x的平方,且A+B-C=0,求c值
已知A-B=5X的平方-3x+1,b-c=6-3x的平方,求C-A的值
人气:235 ℃ 时间:2020-02-06 00:40:44
解答
A+B=2x+x^2+x-2x^2=3x-x^2
因为A+B-C=0
所以C=A+B=3x-x^2还有呢不是还有一道题吗A-B=5X^2-3x+1,b-c=6-3x^2两式相加得a-c=5X^2-3x+1+6-3x^2=2x^2-3x+7c-a=-2x^2+3x-7
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