A.若x=y,则x+a=y-a | B.若m=n,则m+z=n+z | ||||
C.若x=y,则
| D.若x=y,则zx=-zy |
x |
m |
y |
m |
y |
4 |
1 |
2 |
3 |
2 |
1 |
3 |
A.由5=x-2得x=-5-2 | B.由5y=0得y=
| ||
C.由3x=-2得x=-
| D.由2x=3x+5得-5=3x-2x |
3 |
4 |
1 |
12 |
1 |
3 |
A.a=b | B.ma-6=mb-6 | ||||
C.-
| D.ma+8=mb+8 |
A.a-5=b-5 | B.-
| C.(5-c)a=(5-c)b | D.
|
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