有理数运算的简便运算

来源：百度知道 编辑：UC知道 时间：2024/07/07 14:07:44
[1又3分之2-(3分之1-6分之1+12分之5)x2.4]x5

2又14分之13x(-7)

一定要简便哦！！！！！

[1又3分之2-(3分之1-6分之1+12分之5)x2.4]x5
=(5/3-1/3+1/6-5/12)×(2.4×5)
=(5/3-1/3+1/6-5/12)×12
=5/3×12-1/3×12+1/6×12-5/12×12
=20-4+2-5
=13

2又14分之13x(-7)
=-7×(2+13/14)
=-7×2-7×13/14
=-14-13/2
=-14-6-1/2
=-(20+1/2)
=-20又2分之1

1又3分之2-(3分之1-6分之1+12分之5)x2.4]x5
=(5/3-1/3+1/6-5/12)×(2.4×5)
=(5/3-1/3+1/6-5/12)×12
=5/3×12-1/3×12+1/6×12-5/12×12
=20-4+2-5
=13

[1又3分之2-(3分之1-6分之1+12分之5)x2.4]x5
=(5/3-1/3+1/6-5/12)×(2.4×5)
=(5/3-1/3+1/6-5/12)×12
=5/3×12-1/3×12+1/6×12-5/12×12
=20-4+2-5
=13

2又14分之13x(-7)
=-7×(3-1/14)
=-7×3+7×1/14
=-21+1/2
=-20又2分之1