题目内容
下列各式中成立的是
A.a+(-2b+c-3d)=a+2b+c-3d | B.a-(-2b+c-3d)=a+2b-c+3d |
C.a-2(-2b+c-3d)=a+4b+2c-6d | D.a-2(-2b+c-3d)=a+4b-c+3d |
B
A.a+(-2b+c-3d)=a-2b+c-3d , 故错误;
B.a-(-2b+c-3d)=a+2b-c+3d,正确;
C.a-2(-2b+c-3d)=a+4b-2c+6d ,故错误;
D.a-2(-2b+c-3d)=a+4b-2c+6d,故错误;
故选B
B.a-(-2b+c-3d)=a+2b-c+3d,正确;
C.a-2(-2b+c-3d)=a+4b-2c+6d ,故错误;
D.a-2(-2b+c-3d)=a+4b-2c+6d,故错误;
故选B
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