本课配套习题挑战模式1/5

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难度系数:

1.

将方程变形为,甲、乙、丙、丁四名同学都认为是错误的,对于错误的原因,四名同学给出了各自的解释,其中正确的是( )


A:

甲:移项时,没有改变符号

B:

乙:不应该将公子分母同时扩大10倍

C:

丙:去括号时,括号外面是负号,括号里面的项未变号

D:

丁:5不应该变为50

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