17/20×2/3+17/20×1/3-1/2和(3/4-4/9)×36简便算法

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17/20×2/3+17/20×1/3-1/2和(3/4-4/9)×36简便算法

17/20×2/3+17/20×1/3-1/2和(3/4-4/9)×36简便算法
17/20×2/3+17/20×1/3-1/2和(3/4-4/9)×36简便算法

17/20×2/3+17/20×1/3-1/2和(3/4-4/9)×36简便算法
17/20×2/3+17/20×1/3-1/2
=17/20×(1/3+1/3)-1/2
=17/20-1/2
=7/20
(3/4-4/9)×36
=3/4×36-4/9×36
=27-16
=11

17/20×2/3+17/20×1/3-1/2
=17/20×﹙2/3+1/3﹚-1/2
=17/20×1-1/2
=17/20-1/2
=17/20-10/20
=7/20
﹙3/4-4/9﹚×36
=3/4×36-4/9×36
=27-16
=11

17/20×2/3+17/20×1/3-1/2
=17/20×(1/3+1/3)-1/2
=17/20-1/2
=7/20
(3/4-4/9)×36
=3/4×36-4/9×36
=27-16
=11