+= ﹣= 24×= 5﹣=
30÷= += +0.25= ÷=
⑴3.14×52×8﹣3.14×42×7.5 ⑵(+)÷ ⑶4.6×[1÷(2.1﹣2.08)]
=
12.5×8=
3.14×102=
144÷12=
33÷11%=