0乘9还得9. .
25×24=25× +25×4.
0.25×4÷0.25×4=1÷1=1 .(判断对错)
7.56﹣1.58+0.42=7.56﹣(1.58+0.42)=7.56﹣2=5.56 .
能简算要简算 5÷﹣÷5(+)÷(﹣)×33×
能简算要简算 5÷﹣÷5×+ (+)÷(﹣)× 33×