(27+8分之5)×26分之3能简便的要简便计算8分之9×11分之5+11分之2×8分之5 能简便的要简便计算帮我这两题算一下

问题描述:

(27+8分之5)×26分之3能简便的要简便计算
8分之9×11分之5+11分之2×8分之5 能简便的要简便计算帮我这两题算一下

(27+8分之5)×26分之3
=(26+8分之13)×26分之3
=26×3/26+13/8×3/26
=3+3/16
=3又3/16
8分之9×11分之5+11分之2×8分之5
=9/8×5/11+5/11×2/8
=(9/8+2/8)×5/11
=11/8×5/11
=5/8

1式=(26+13/8)×3/26
=26×3/26+13/8×3/26
=3+3/16
=3又3/16
2式=9/8×5/11+5/11×2/8
=5/11×(9/8+2/8)
=5/11×11/8
=5/8