Bài 2;tính a, 1/5+(-1/3+9/5)+-7/6 b,(12/13+7)+(-8+1/13) c,(-4/5+2/3)+(-5/4+14/5)+(7/3-2) d,, -8+-3/5+7/10+9+-33/30

Bài 2;tính
a, 1/5+(-1/3+9/5)+-7/6
b,(12/13+7)+(-8+1/13)
c,(-4/5+2/3)+(-5/4+14/5)+(7/3-2)
d,, -8+-3/5+7/10+9+-33/30

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  1. Đáp án:

     

    Giải thích các bước giải:

     `a, 1/5 + (-1/3 + 9/5 )+(-7/6)`

    `=1/5 + ([(-1).5]/3.5 + (3.9)/(3.5))-7/6`

    `=1/5 + [(-5)/15+27/15]- 7/6`

    `=1/5 + (27-5)/15 – 7/6`

    `=1/5 + 22/15 -7/6`

    `=3/15 + 22/15 – 7/6`

    `=25/15 -7/6`

    `=5/3 – 7/6`

    `= 10/6 – 7/6`

    `=3/6`

    `=1/2`

    `b, (12/13 +7)+(-8 + 1/13)`

    `= (12/13 +91/13) + (-104/13 +1/13)`

    `=103/13 + (-103)/13`

    `=0`

    `c, (-4/5 +2/3 )+(-5/4 +14/5)+(7/3-2)`

    `=(-12/15 + 10/15)+(-25/20 + 56/20 )+(7/3 – 6/3)`

    `=-2/15 + 31/20 + 1/3`

    `=-8/60 + 93/60 + 20/60`

    `=(-8+93+20)/60`

    `=105/60`

    `=7/4`

    `d, -8 + (-3)/5 + 7/10+9+(-33)/30`

    `=(-80)/10 + (-6)/10 + 7/10 + 90/10 + (-11)/10`

    `=(-80-6+7+90-11)/10`

    `=0/10`

    `=0`

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  2. Đáp án:

     `↓↓↓`

    Giải thích các bước giải:

    `a)` `1/5+((-1)/3+9/5)+(-7)/6`

    `=1/5-1/3+9/5-7/6`

    `=(1/5+9/5)-(1/3+7/6)`

    `=2-3/2`

    `=1/2`

    `b)` `(12/13+7)+(-8+1/13)`

    `=12/13+7-8+1/13`

    `=(12/13+1/13)+(7-8)`

    `=1+(-1)`

    `=0`

    `c)` `(-4/5+2/3)+(-5/4+14/5)+(7/3-2)`

    `=(-4)/5+2/3-5/4+14/5+7/3-2`

    `=((-4)/5+14/5)+(2/3+7/3)-(5/4+2)`

    `=2+3-13/4`

    `=7/4`

    `d)` `(-8)+(-3)/5+7/10+9+(-33)/30`

    `=(-8)-3/5+7/10+9-33/30`

    `=(-8)-3/5+7/10+9-11/10`

    `=(-8+9)-3/5+(7/10-11/10)`

    `=1-3/5+(-2)/5`

    `=1-3/5-2/5`

    `=0`

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