(-11)^ 2 -3. (x - 4) = 76)
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3 x 8 x 76 + 2 x 35 x 12 - 4 x 11 x 6
= ( 3 + 2 ) x ( 8 + 35 ) x ( 76 + 12 ) - 4 x 11 x 6
= 5 x 43 x 88 - 4x 11 x 6
= ( 5-4 ) x ( 43 - 11 ) x ( 88 - 6 )
= 1 x 32 x 82
= 2624
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1: \(\dfrac{4}{23}+\dfrac{5}{21}+\dfrac{1}{2}-\dfrac{4}{23}+\dfrac{16}{21}\)
\(=1+\dfrac{1}{2}\)
\(=\dfrac{3}{2}\)
2: \(\left(\dfrac{1}{3}+\dfrac{12}{67}+\dfrac{13}{41}\right)-\left(\dfrac{79}{67}-\dfrac{28}{41}\right)\)
\(=\dfrac{1}{3}+\dfrac{12}{67}+\dfrac{13}{41}-\dfrac{79}{67}+\dfrac{28}{41}\)
\(=\dfrac{1}{3}\)
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3 x 8 x 76 + 2 x 35 x 12 - 4 x 11 x 6
= 24 x 76 + 24 x 35 - 24 x 11
= 24 x (76 + 35 - 11)
= 24 x 100
= 2400
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3 x 8 x 76 + 2 x 35 x 12 + 4 x 11 x 6
= 24 x 76 + ( 12 x 2 ) x 35 + ( 4 x 6 ) x 11
= 24 x 76 + 24 x 35 +24 x 11
= 24 x ( 76 + 35 + 11 )
= 24 x 122
= 24 x 100 x 22
= 2400 x 11 x 2 = 26400 x 2 = 52800
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a, (x+15) - (-x+1) = 12 b, (x-2) - (2x-2) = -2
x+15+x-1 = 12 x-2- 2x+2 = -2
2x +14 =12 -x = -2
2x = 2 x = 2
x = 1
c, x+2- (5x-16) = 4x-6 d, 15- 3x+4 = 85-x
x+2 - 5x+ 16 = 4x-6 19-3x = 85-x
-4x +18 = 4x-6 19-85 = -x+3x
-4x-4x = -6-18 -66 = 2x
-8x = -24 x = 33
x = 3
e, (-11)2 - 5(x-1) = 76+x
121 - 5x+5 = 76+x
126 -5x = 76+x
126- 76 = x+5x
50 = 6x
x = 25/3
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a) 4 x 76 + 76 x 7
= (4 + 7) x 76
= 11 x 76
= 836
b) 4 x 54 + 54 x 2 + 5 x 54
= (4 + 4 + 5) x 54
= 13 x 54
= 702
c) 37 + 3 x 37 + 5 x 37 + 2 x 37
= 37 x (3 + 5 + 2)
= 37 x 10
= 370
a) 4 x 76 + 76 x 7
= (4 + 7) x 76
= 11 x 76
= 836
b) 4 x 54 + 54 x 2 + 5 x 54
= (4 + 4 + 5) x 54
= 13 x 54
= 702
c) 37 + 3 x 37 + 5 x 37 + 2 x 37
= 37 x (3 + 5 + 2)
= 37 x 10
= 370
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{2}{7}\) của -\(\dfrac{11}{6}\) là: - \(\dfrac{11}{6}\) \(\times\) \(\dfrac{2}{7}\) = - \(\dfrac{11}{21}\)
\(\dfrac{3}{4}\) của 76 ki - lô - mét là: 76 km \(\times\) \(\dfrac{3}{4}\) = 57 km
\(\dfrac{5}{8}\) của 96 tấn là: 96 \(\times\) \(\dfrac{5}{8}\) = 60 tấn
0,25 của \(x\) giờ là 1 giờ thì \(x\) = 1giờ : 0,25 = 4 giờ
3,7% của \(x\) là 13,5 thì \(x\) = 13,5 : 3,7 \(\times\) 100 = \(\dfrac{1350}{37}\)
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a) =(7/11+4/11)+(3/4+1/4) b)=>4/5x=12 c)=>x-6/10=1/10 d)tự làm e)=>4/x=4/20 f)=>198/33+x/33=21/33
=1+1 x=12.5/4 x=1/10+6/10 =>x=20 =>x=21-198
=2 x=15 x=7/10 =>x=-177
(-11)2 - 3.(\(x\) - 4) = 76
121 - 3\(x\) + 12 = 76
121 + 12 - 76 = 3\(x\)
3\(x\) = 57
\(x\) = 57 : 3
\(x\) = 19
\(121-3\left(x-4\right)=76\)
\(3\left(x-4\right)=126-76\)
\(3\left(x-4\right)=50\)
\(x-4=\dfrac{50}{3}\)
\(x=\dfrac{62}{3}\)