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\(2\frac{1}{2}-\frac{13}{5}\le\frac{x}{3}\le\frac{-1}{3}+\frac{2}{7}+3\frac{1}{5}\)
\(\frac{-1}{10}\le\frac{x}{3}\le\frac{331}{105}\)
\(-\frac{105}{1050}\le\frac{350x}{1050}\le\frac{3310}{1050}\)
\(\Rightarrow-105\le350x\le3310\)
Tự làm nốt
c.53 ×39+47×39 + 53 x 21 + 47 x 21=6000
D . 2 x 53 x 12 + 4 x 6 x 87 - 3 x 8 x 40=2400
học tốt
C ) = 39 . ( 53 + 47 ) + 21 . ( 53 + 47 )
= 39 . 100 + 21 . 100
= (39 + 21) . 100
= 60 . 100
= 6000
D ) = 24 . 53 + 24 . 87 - 24 . 40
= 24 . ( 53 + 87 - 40 )
= 24 . 100
= 2400
|Câu d:
x = 3/4 + 1/-12
x = 9/12 - 1/12
x = 8/12
x = 2/3
Vậy x = 2/3
Câu e:
x /14 = 1/7 + (-3)/14
x/14 = 1/7 - 3/14
x/14 = 2/14 - 3/14
x/14 = -1/14
x = - 1/14 x 14
x = -1
Vậy x = -1
Câu 1:
a; x/7 = - 9/14
x = - 9/14 x 7
x = - 9/2
Vậy x = -9/2
b; - 16/36 = - y/4
-4/9 = - y/4
y = -4/9 x (-4)
y = 16/9
Vậy y = 16/9
Câu 1c:
-5/12 = x/60
x = -5/12 x 60
x = - 25
Vậy x = - 25
d: -4/8 = x/-10 = -7/y
-4/8 = x/-10
x = -4/8 x (-10)
x = 5
-4/8 = -7/y
y = - 7 : (-4/8)
y = 7 x 8/4
y = 14
Vậy (x; y) = (5; 14)
a)\(12-\left[25+\left(6+3\right)^2\right]\)
\(=12-\left[25+9^2\right]\)
\(=12-\left[25+81\right]\)
\(=12-106\)
\(=\left(-94\right)\)
b) \(315-\left(8^6\div8^4-12.3+7+7^3\right)\)
\(=316-\left(8^2-36+7+343\right)\)
\(=316-\left(64-43+343\right)\)
\(=316-\left(21+343\right)\)
\(=316-364\)
\(=\left(-48\right)\)
c) \(-81-108\)
\(=-\left(81+108\right)\)
\(=\left(-189\right)\)
d) \(-13-91\)
\(=-\left(13+91\right)\)
\(=\left(-104\right)\)
e)\(-85-\left(-17\right)\)
\(=-85+17\)
\(=-\left(85-17\right)\)
\(=\left(-68\right)\)
g) \(63.\left(-8\right)+\left(-63\right).92\)
\(=63.\left(-8\right)+63.\left(-92\right)\)
\(=63.\left[\left(-8\right)+\left(-92\right)\right]\)
\(=63.\left(-100\right)\)
\(=\left(-6300\right)\)
h) \(\left(-18\right).9-9.18\)
\(=18.\left(-9\right)-9.18\)
\(=18.\left[\left(-9\right)-9\right]\)
\(=18.\left(-18\right)\)
\(=\left(-324\right)\)
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