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1) 2,75 - 5/6 × 2/5 = 2,75 - (5/6) × (2/5) = 2,75 - 1/3 = 2,75 - 0,33 = 2,42
2) 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 3/4) - 3/5 = 1,25 - (5/6 - 9/12) - 3/5 = 1,25 - (10/12 - 9/12) - 3/5 = 1,25 - 1/12 - 3/5 = 1,25 - 0,08 - 0,6 = 1,25 - 0,68 = 0,57
3) 4/9 × 0,75 + 8/5 + 3,125 = (4/9) × 0,75 + 8/5 + 3,125 = 0,44 + 8/5 + 3,125 = 0,44 + 1,6 + 3,125 = 0,44 + 4,725 = 5,165
4) 1,125 - 4/7 - 0,12 = 1,125 - (4/7) - 0,12 = 1,125 - 0,57 - 0,12 = 0,435 - 0,12 = 0,315
5) (1/3 + 0,4) × 3,5 + (1/6 + 0,75) × 6/5
![](https://rs.olm.vn/images/avt/0.png?1311)
=1/2:1/2-1/4:1/4+1/8:1/8-1/10:1/10+5/4
=1/2x2-1/4x4+1/8x8-1/10x10+5/4
= 1 - 1 + 1 - 1+5/4
= 5/4
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3.75 : \(\dfrac{1}{4}\) + 3.75 : 0.5 + 3,75 + \(\dfrac{1}{8}\) + 3,75 x 86
= 3,75 : \(\left(\dfrac{1}{4}+0.5+\dfrac{1}{8}\right)\) + 3,75 x 86
= 3,75 : \(\dfrac{7}{8}\) + 322.5
= 4,3 + 322.5 = 326,8
tích hộ chị nha
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0,36 * 550 + 0,18 * 126 * 2 + 3 * 324 * 0,12
= 0,36 * 550 + ( 0,18 * 2 ) * 126 + ( 3 * 0,12 ) * 324
= 0,36 * 550 + 0,36 * 126 + 0,36 * 324
= 0,36 x ( 550 + 126 + 324 )
= 0,36 x 1000
= 360
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2:
a: =>x:16=30,34+3,4-24,3=9,44
=>x=151,04
b: Đề thiếu rồi bạn
\(\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{6}+\frac{1}{8}\right)\times\left(1,25\times0,36-3,75\times0,12\right)\)
\(=\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{6}+\frac{1}{8}\right)\times\left(1,25\times0,36-1,25\times3\times0,12\right)\)
\(=\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{6}+\frac{1}{8}\right)\times\left(1,25\times0,36-1,25\times0,36\right)\)
\(=\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{6}+\frac{1}{8}\right)\times0\)
\(=0\)
( 1/2 + 1/4 + 1/6 + 1/8 + 1/10 ) × ( 1,25 × 0,36 - 3,75 × 0,12 )
= ( 1/2 + 1/4 + 1/6 + 1/8 + 1/10 ) × 0
(3,75 : 1,25 = 3 ; 0,36 : 0,12 = 3 )
= 0