4年级下册数学口算乘法50题。120+90=543-306=300÷12=120×5=12+18+14=62+160+38=14×60=203-80=50×15×4=175-56=250×8=4......
25x32x125=2000039x101=39391.37+1+7.63=105.6+2.7+4.4=12.7 9.14-1.43-4.57=3.1477+2.7+2.3+25=1071.88......
1、240+480÷30×2 =240+16×2 =240+32 =272 2、225-10×(6+13) =225-10×19 =225-190 =35 3、(120×2+120)÷9 =(2......