①
②÷13+ ×
③
④
2.5÷=
4×3.14=
43-4.5=
628÷3.14=
4:0.25=
6÷1.5=
0.42:()3=
( ):9=
3.14×20= 2×= 1+= ()×9=
72÷= 1.5×100= 1.25×8= 99×0.8+0.8=
x∶(1-40%)=24∶3
①59×101
②4×+4×
③×[÷(—)]
④12.5×32×2.5
(-+)×12 0.25×32×12.5%
99×55%+0.55 125%×3.2×25%