50%×2.5××64 32 × (+)
(1-75%)÷(1+) ÷[( -0.75)×60%]
7.8÷0.2=
72×2-3.5=
12×(23-12)=
13-15+13=
4×(1-10%)=
58-62.5%=
13+50%=
47÷12+37×2=
300×(1+3.75%×2) 0.25×45+25%×15
[20-(0.4+1)]×50% 5.6×34+0.75+3.4×75%
59×11+59×7 (14+32×49)÷50% 0.25×4.5×40%