3020-105=
1.8+0.82=
4.8÷0.24=
4.2+8.7÷0.29=
+0.72=
1.25×0.8=
0.24:3=3:x
[(1)]
12÷5%=
25%÷=
10%+1%=
1﹣25%﹣60%=
3.14×102 = 16×25%= 10-0.09=
= (-)×12= 36÷30%=
58+142= = 4.8÷100=
7÷ = - - = 12.5×0.25×4=
情况如图。