8×0.25=
7-=
40%×63=
×÷×=
530÷10=
12.6÷0.3=
+0.625=
3.5﹣1.7=
200毫升=升 9时20分=时
7.63﹣2.8+1.37
4.5×8×1.25
6.4×+3.6×
x=5.4 x+60%=3 x﹣0.4x=9.6
0.5x+14=20 20:x=8:2.2 3-2x=