A.m=1,n=0 | B.m=2,n=1 | C.m=1,n=2 | D.m=0,n=1 |
2 |
3 |
1 |
2 |
A.a2-2a-b+c=a2-(2a-b+c) |
B.(a+b)-(-d+c)=a+b+c+d |
C.2a-7b+3c-1=2a-[7b-(3c-1)] |
D.a-(b+c-d)=a-b+c-d |
A.-5xyz与5xy | B.-2与-a | ||
C.4xy与-xy2 | D.7a2b与
|
A.-|-3|=3 | B.23=6 | ||
C.-3÷
| D.2x3y2-3y2x3=-x3y2 |
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