4.28×31+42.8×2.9+8.56×20用因式分解的方法解
问题描述:
4.28×31+42.8×2.9+8.56×20用因式分解的方法解
答
4.28×31+42.8×2.9+8.56×20
=4.28×31+4.28×29+4.28×40
=4.28x(31+29+40)
=4.28x100
=428