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a, 2x -(25-x)=38
\(\Leftrightarrow\)2x - 25 + x = 38
\(\Leftrightarrow\)3x = 63
\(\Leftrightarrow\)x = 21
b, x - 16 = 72 - 3x
\(\Leftrightarrow\)4x = 88
\(\Leftrightarrow\)x = 22
a) \(\left(2x-1\right)+\frac{3}{15}=\frac{3}{2}\)
\(\Rightarrow2x-1=\frac{3}{2}-\frac{3}{15}=\frac{13}{10}\)
\(\Rightarrow2x=\frac{13}{10}+1=\frac{23}{10}\)
\(\Rightarrow x=\frac{23}{20}\)
b) \(x+\frac{46}{15}=1,5\)
\(\Rightarrow x+\frac{46}{15}=\frac{3}{2}\)
\(\Rightarrow x=\frac{3}{2}-\frac{46}{15}\)
\(\Rightarrow x=\frac{-47}{30}\)
c) \(\left(-2x+1\right)+\frac{3}{15}=\frac{5}{3}\)
\(\Rightarrow-2x+1=\frac{5}{3}-\frac{3}{15}=\frac{22}{15}\)
\(\Rightarrow-2x=\frac{7}{15}\Rightarrow x=\frac{-7}{30}\)
a)5.(-8).2.(-3)
=[5.(-2)].[(-8).(-3)]
=-10.24
=-240
b)(45-135+72)-(45+72)
=45-135+72-45-72
=(45-45)+(72-72)-135
=0+0-135
=-135
c)3.(-5)2.2+2.(-5)-20
=3.25.2+2(-5)-20
=75.2+(-10)-20
=150+(-30)
=120
d)86.(-46)+46.27-46.41
=86.(-1).46+46.27-46.41
=-86.46+46.27-46.41
=46(-86+27-41)
=46(-100)
-4600
e)34(15-10)-15(34-10)
=34.15-34.10-15.34+15.10
=(34.15-15.34)+(15.10-34.10)
=[34(15-15)]+[10(15-34)]
=34.0+10(-9)
=0+(-90)
=-90
câu 1:
= \(-102+\left[9.\left(-2\right)+8\right]:13\)
= \(-102-\frac{10}{13}\)
= \(\frac{-1336}{13}\)
Câu 2
a)
=\(-15\left(53+47\right)\)
= -15.100
=-1500
b)
= -46 ( 214+27-41)
= -46.200
= -9200
a, -16 + 23 + x = -16
=> -7 + x = -16
=> x = -16 - (-7)
=> x = -9
b, 2x - 35 = 15
=> 2x = 15 + 35
=> 2x = 50
=> x = 50 : 2
=> x = 25
c, 3x + 17 =11
=> 3x = 11 - 17
=> 3x = -6
=> x = -6 : 3
=> x = -2
d, | x - 1 | = 0
=> x - 1 = 0
x = 0 + 1
x = 1
e, -13 . | x | = -26
=> | x | = -26 : (-13)
=> | x | = 2
=> x = 2
1) -16 + 23 + x = - 16
ó x = -23
2) 2x – 35 = 15
ó 2x = 50
ó x = 25
3) 3x + 17 = 12
ó 3x = -5
ó x = -5/3
4) │x - 1│= 0
=> x – 1 = 0 ó x = 1
5) -13 .│x│ = -26
ó |x| = 2
ó x = 2 hoặc x = -2
Ta có: -(-15)-3x+46=72-16+2x
15-3x+46=56+2x
61-3x=56+2x
61-56=2x+3x
5 = 5x
x=5:5=1]
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