124乘13加76乘24加54乘41用简便方法计算
解:采用分配律,
原式=124x13+76x24+54x41
=124x(10+3)+76x(20+4)+54x(40+1)
=1240+124x3+1520+76x4+2160+54
=1240+1520+2160+372+304+54
=2760+2160+676+54
=4920+730
=5650
124x13+76x24+54x41
=100x13+24x13+76x24+24x41+30x31
=1300+24x(13+76+41)+930
=1300+24x130+930
=1300+24x100+24x30+930
=1300+2400+720+930
=3700+1650
=5350
123×13+76×24+54×41
=123×13+13×144+13×164-2×24+2×41
=(123+144+164)×13-2×(24-41)
=431×13+2×17
=400×13+30×13+13+34
=5200+390+47
=5200+437
=5637
计算机