42×41⼀三四十三的简便算法

2024-10-28 09:54:16
推荐回答(1个)
回答(1):

42×41/43
=(43-1)×42/43
=43×42/43-1×42/43
=42-42/43
=41又1/43
1/8×1/12+1/3×1/8
=1/8×(1/12+1/3)
=1/8×5/12
=5/96
4/11×10+4/11
=4/11×(10+1)
=4/11×11
=4