60:40=()/() 0.5:0.4=()/()
60:40=()/() 0.5:0.4=()/()
16分之7*14*21分之4= (0.4-0.4)*8= 0.5+0.5÷0.5+0.5=
1.6÷()=4分之()=0.4=40%
19.6÷0.4÷0.5= (用简便算法)
()除以5=0.4=12分之()=():40
几分之2=0.4除以0.5=( ):5=( )%
():()=45分之()=0.4=()%
x(120-(x-60)×0.5)=8800
3 () -- =30÷40=0.75÷0.4=-- =()% 4 36
40+( )×3=60 __
计算(0.5x-0.01/0.2)-0.5=0.4x-0.06/1.2
(+0.5)+(-0.25)+(-10.1)=?