12.4÷5=
6.56÷3.2=
★64.8÷0.8=
4(x+3.9)=25.2
0.8x-7.8=1.4
3.2÷0.8+0.3x=25
3.9÷2×(4.94﹣3.64)
72÷[(3.7﹣2.5)×0.4]
3.36÷[6.3﹣(5.32﹣1.82)]
3.8×0.6+12.5÷0.5