128×125×25×5=(2x4x8x2)×125×25×5=(8x125)x(4x25)x(2x5)x2=1000x100x10x2=2000000运用乘法分配律、结合律之前,想到凑整。希望能帮到你!
128×125×25×5=(8×4×4)×125×25×5=8×125×(25×4)×(4×5)=1000×100×20=200000