A.在等式ab=ac两边都除以a,可得b=c | ||||
B.在等式a=b两边都除以x2+1,可得
| ||||
C.在等式
| ||||
D.在等式3x=3a-b两边都除以3,可得x=a-b |
a |
x2+1 |
b |
x2+1 |
b |
a |
c |
a |
b |
3 |
a |
x |
b |
x |
a |
x |
b |
x |
a |
b |
7 |
4 |
a |
b |
7 |
4 |
A.1个 | B.2个 | C.3个 | D.4个 |
A.由5x+2=3x-1,得5x+3x=2-1 | ||
B.由
| ||
C.由ax=a,得x=1 | ||
D.由-
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A.若x+3=y-7,则x+7=y-11 |
B.若0.25x=-4,则x=-1 |
C.若7y-6=5-2y,则7y=11-2y |
D.若7x=-7x,则7=-7 |
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