解方程
x
+15.7=31.91x=
[ ]
|
A .8.5 |
B .16.2 |
|
C .4.5 |
D .11.15 |
方程“7.5+5x=10”的解是
[ ]
|
A.x=0.5 |
B.x=0.6 |
C.x=6 |
D.x=14 |
方程“7x-18=80”的解是
[ ]
|
A.x=0.5 |
B.x=0.6 |
C.x=6 |
D.x=14 |