- = ÷6= ÷ = 25×11×4=
×12= 0.3×2= 2.4× = 1÷ -1× =
⑴ ⑵
215-108=
42.3÷77=
×0=
▲9.9×9÷1=
12-÷4=
25×20=
12-=
1.1×0.01=
1÷-×1=
a÷÷2a=
8.1÷0.27=
-×=
3.98+0.2=
0.23=
41-2.9-1.1=
502×39≈
10-0.09=
×÷×=
1-+= 9﹣0.9= 1÷×= 0.5-+0.5-=
8.1+= 72÷0.4= (+)×24= 7÷×7×7=