3.72+0.5=
7﹣1.96=
2.4×0.5=
0.39÷1.3=
21÷ =
0.2×0.1=
3.7÷10%=
1.3×1.25×8=
9.2÷2.3=
5﹣2 =
6000﹣105×36
6.35÷6.2+14.5
5.7×2.8+5.7×6.2+5.7
( + )×24
÷( +0.8)
÷[( + )× ]
x+3.4x=7
10:x= :
x﹣ x= .