Question

简便计算： (2/3+5/12)x12，5/9x(8/13x9/10)， 2/9-7/16x2/9

简便计算：
(2/3+5/12)x12，5/9x(8/13x9/10)，
2/9-7/16x2/9，11/8x4/7-0.375x4/7

Answer 1

1、原式
=12×2/3+12×5/12
=8+5
=13
2、原式
=5/9 ×9/10×8/13
=1/2×8/13
=4/l3

追答

3、原式
=2/9×(1-7/16)
=2/9×9/16
=1/8
4、原式
=4/7×(11/8-3/8)
=4/7

Answer 2

(2/3+5/12)x12
=2/3×12+5/12×12
=8+5
=13

5/9x(8/13x9/10)
=(5/9×9/10)×8/13
=1/2×8/13
=4/13

2/9-7/16x2/9
=(1-7/16)×2/9
=9/16×2/9
=1/8

11/8x4/7-0.375x4/7
=11/8×4/7-3/8×4/7
=(11/8-3/8)×4/7
=1×4/7
=4/7