Tính a.4/11+ -5/13+7/11- 8/13 +1/2 b.1/3-2/3÷4/3 c.1/4-(3/8+ 1/4+5/2)÷2/3

07/08/2021 Bởi Everleigh

Tính
a.4/11+ -5/13+7/11- 8/13 +1/2
b.1/3-2/3÷4/3
c.1/4-(3/8+ 1/4+5/2)÷2/3

0 bình luận về “Tính a.4/11+ -5/13+7/11- 8/13 +1/2 b.1/3-2/3÷4/3 c.1/4-(3/8+ 1/4+5/2)÷2/3”

kimoanh

07/08/2021 vào lúc 05:31

a, 4/11+ -5/13+7/11- 8/13 +1/2

=4/11+7/11+-5/13-8/13 +1/2

= 1+(-1) +1/2

=1/2

b, 1/3-2/3÷4/3

=1/3-1/2

=-1/6

c, $\frac{1}{4} - (\frac{3}{8} + \frac{1}{4} + \frac{5}{2}) : \frac{2}{3}$

$= \frac{1}{4} - (\frac{3}{8} + \frac{2}{8} + \frac{20}{8}) \times \frac{3}{2}$

$= \frac{1}{4} - \frac{25}{8} \times \frac{3}{2}$

$= \frac{1}{4} - \frac{75}{16}$

$= \frac{4}{16} - \frac{75}{16}$

$= - \frac{71}{16}$
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ngochoa

07/08/2021 vào lúc 05:31

Đáp án:

a,`4/11 – 5/13 + 7/11 -8/13 + 1/2`

`=(4/11 + 7/11) -(5/13 + 8/13) +1/2`

`=1-1 +1/2=1/2`

b, `1/3 – 2/3 : 4/3`

`=1/3 – 2/3 xx 3/4`

`=1/3 – 1/2 `

`=2/6-3/6=-1/6`

c,`1/4 -(3/8 + 1/4 + 5/2) : 2/3`

`=1/4 – (3/8 + 2/8 + 20/8) xx 3/2`

`=1/4 – 25/8 xx 3/2`

`=1/4 – 75/16`

`=4/16-75/16`

`=-71/16`

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