Question

递等式计算(怎么简便怎么算)。(1)3/11x2/7x7x1/2，(2)0.7x3/8+0.3x3

递等式计算(怎么简便怎么算)。(1)3/11x2/7x7x1/2，(2)0.7x3/8+0.3x3/8，(3)3/4x5/6+1/6÷4/3，(4)7又7/10x1又5/9+2.3÷（）(填不是1或0的数)

Answer 1

(1)3/11x2/7x7x1/2=3/11x（2/7x7x1/2）=3/11x（2x1/2）=3/11，
(2)0.7x3/8+0.3x3/8=（0.7+0.3）x3/8=1x3/8=3/8，
(3)3/4x5/6+1/6÷4/3=3/4x5/6+1/6x3/4=3/4x(5/6+1/6)=3/4，
(4)7又7/10x1又5/9+2.3÷（9/14）=77/10x14/9+23/10x14/9=(77/10+23/10)x14/9=140/9
=15又5/9

Answer 2

Answer 3

3/11x2/7x7x1/2
=3/11x2x1/2
=3/11x1
=3/11

0.7x3/8+0.3x3/8
=3/8x(0.7+0.3)
=3/8x1
=3/8

3/4x5/6+1/6÷4/3
=3/4x5/6+1/6+3/4
=3/4x(5/6+1/6)
=3/4x1
=3/4

7又7/10x1又5/9+2.3÷（9/14）
=77/10x14/9+23/10x14/9
=14/9x(77/10+23/10)
=14/9x10
=140/9