能简算的要简算 (3)11/12×5/7+11/12×2/7 (4)7/8×15+7/8

问题描述:

能简算的要简算 (3)11/12×5/7+11/12×2/7 (4)7/8×15+7/8
(3)11/12×5/7+11/12×2/7
(4)7/8×15+7/8

(3) 11/12x5/7+11/12x2/7
=11/12x(5/7+2/7)
=11/12
(4)7/8x15+7/8
=7/8x(1+15)
=7/8x16
=14