科目: 來(lái)源: 題型:013
[ ]
A. 3x6-7x9+28x6-7x4=31x6-7x9+7x4
B. 9x6-7x6+7x6+7x3=9x6+7x3
C. 27x5-7x9-28x6-7x3
D. 27x6-7x6+28x6+7x4=48x6+7x4
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科目: 來(lái)源: 題型:013
下列各式的計(jì)算中, 結(jié)果錯(cuò)的是
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A. (xm+1y-2x2m+3ym-1)(-xmym)2
=x3m+1y2m+1-2x4my2m+3x2my3m-1
B.
C.
=-2x4n+1y-x4n+2y2+x4n+4yn
D. (a2n+3xn+3-3a2n+1xn+2+5an+1xn+1+6anxn)(-an+1x)
=-a3n+4xn+4-3a3n+2xn+3+5a2n+2xn+2+6a2n+1xn+1
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