(50-40×1.2)÷0.5=(50-48) ÷0.5=20 ÷5=4
8×4×125×25=8×125x4×25=1000x100=100000
18.8-3分之2-3.8-3分之1= 18.8-3.8-(1/3+2/3)=15-1=14
32×71.1+28.9×32=32(71.1+28.9)=32x100=3200
(50-40×1.2)÷0.5=(50-48) ÷0.5=20 ÷5=4
8×4×125×25=8×125x4×25=1000x100=100000
18.8-3分之2-3.8-3分之1= 18.8-3.8-(1/3+2/3)=15-1=14
32×71.1+28.9×32=32(71.1+28.9)=32x100=3200