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(13+49)-(13-135+49)
= 13 + 49 - 13 +135 - 49
=135
(18+29)+(158-18-29)
=18+29+158-18-29
=158
4.52-3.(24-9)
= 4.25-3.24-9
=19
[93-(20-7)]:16
=93-20+7:16
=73,4375
\(\left(13+49\right)-\left(13-135+49\right)\)
\(=13+49-13+135-49\)
\(=135\)
\(\left(18+29\right)+\left(158-18-29\right)\)
\(=18+29+158-18-29\)
\(=158\)
\(4.5^2-3.\left(24-9\right)\)
\(=4.25-3.24+3.9\)
\(=100-72+27\)
\(=28+27\)
\(=55\)
\(\left\{93-\left(20-7\right)\right\}:16\)
\(=\left(93-20+7\right):16\)
\(=\left(73+7\right):16\)
\(=80:16\)
\(=5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Vì 80 16 và 176
16 nên ƯCLN (16, 80, 176) = 16;
b) Ta có 18 = 2 . 32 ; 30 = 2 . 3 . 5; 77 = 7 . 11. Do đó 18 , 30, 77 không có ước chung nào khác 1. Vậy ƯCLN (18, 30, 77) = 1.
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 72 - 20 + 135 b, (-26) + 16 + (-34) + 26 c, 24.82 + 24.18 - 100
= 52 + 135 =( -26 + 26) - ( 34 - 16) = 24. ( 82 + 18) - 100
= 187 = 0 - 18 = 24 . 100 - 100
= -18 = 100.( 24 - 1)
= 2300
![](https://rs.olm.vn/images/avt/0.png?1311)
a)(13+49)-(13-135+49)
=13+49-13+135-49
=13-13+49-49+135
=0+0+135
=135
b)(18+29)+(158-18-29)
=18+29+158-18-29
=18-18+29-29+158
=0+0+158
=158
c)4 .52-3 .(24-9)
=4. 52- (3.24-3.9)
=4. 52-3.24+3.9
=4.25-72+27
=100-72+27
=28+27
=55
d)[93-(20-7)]:16
=(93-20+7):16
=80:16
=5
chúc cậu hok tốt
a) (13 + 49) - (13 - 135 + 49)
= 13 + 49 - 13 + 135 - 49
= (13 - 13) + (49 - 49) + 135
= 0 + 0 + 135
= 135
b) (18 + 29) + (158 - 18 - 29)
= 18 + 29 + 158 - 18 - 29
= (18 - 18) + (29 - 29) + 158
= 0 + 0 + 158
= 158
c) 4.52 -3.(24 - 9)
= 4.25 - 3.15
= 100 - 45
= 55
d) [93 - (20 - 7)] : 16
= [93 - 13] : 16
= 80 : 16
= 5
![](https://rs.olm.vn/images/avt/0.png?1311)
câu sai là câu c)-4/15 = 16/60
lí do cx như bn đỗ ngọc thùy dương.
:)))
![](https://rs.olm.vn/images/avt/0.png?1311)
\(135.\left(33+20\right)-33.\left(133+20\right)\)
\(=135.53-33.153\)
\(=7155-5049\)
\(=2106\)
Học Tốt !
![](https://rs.olm.vn/images/avt/0.png?1311)
135 - ( 2 - x ) = ( x - 934 ) - 16
\(\Leftrightarrow\) 135 - 2 + x = x - 934 - 16
\(\Leftrightarrow\) 135 - 2 + x = x - 950
\(\Leftrightarrow\) 0x = 950 - 135 + 2
\(\Leftrightarrow\) 0x = 717
\(\Leftrightarrow\) x \(\in\varnothing\)
![](https://rs.olm.vn/images/avt/0.png?1311)
135 - (2 - x) = ( x - 934) - 16
=> 135 - 2 + x = x - 934 - 16
=> 133 + x = x - 920
=> 133 + 920 = 2x
=> 1053 = 2x
=> x = 1053 / 2
135-(2-x)=(x-934)-16
(x-934)-(2-x)=135-16=119
2x-934-2=119
2x-932=119
2x=119+932
2x=1051
x=1051:2
x=525,5
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\left(13+49\right)-\left(13-135\right)\)
= \(13+49-13+135\)
= \(13-13+49+135\)
= \(184\)
\(b,\left(18+29\right)+\left(158-18-29\right)\)
= \(18+29+158-18-29\)
= \(158\)
\(c,4.5^2-3.\left(24-9\right)\)
= \(4.25-\left(72-27\right)\)
= \(100.-45\)
= \(55\)
\(d,\left[93-\left(20-7\right)\right]:16\)
= \(\frac{93-20+7}{16}\)
= \(\frac{80}{16}\)
= \(5\)