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a) 7 - x =8-(-7) b) x-8 = (-3)-8
7 - x = 15 x-8 = -11
x = 7-15 x = -11+8
x = -8 x = -3
a) 7 - ( 18 + x ) = - 15
18 + x = 7+ 15
18 + x = 22
x = 22 - 18
x = 4
vậy x= 4
Trl:
a) \(7-\left(18+x\right)=-15\)
\(\Rightarrow\left(18+x\right)=7-\left(-15\right)\)
\(\Rightarrow\left(18+x\right)=7+15\)
\(\Rightarrow\left(18+x\right)=22\)
\(\Rightarrow x=22-18\)
\(\Rightarrow x=4\)
b) \(\left(x-17\right)-\left(-3\right)=0\)
\(\Rightarrow\left(x-17\right)+3=0\)
\(\Rightarrow\left(x-17\right)=0-3\)
\(\Rightarrow\left(x-17\right)=-3\)
\(\Rightarrow x=-3+17\)
\(\Rightarrow x=14\)
Trl:
Ko chắc đâu
a) \(20-x=8-\left(26-10\right)\)
\(\Rightarrow20-x=8-16\)
\(\Rightarrow20-x=-8\)
\(\Rightarrow20-\left(-8\right)\)
\(\Rightarrow x=28\)
b) \(x-13=-13-14\)
\(\Rightarrow x-13=-27\)
\(\Rightarrow x=-27+13\)
\(\Rightarrow x=-14\)
a)20-x=8-(26-10)
20-x=-8
x=20-(-8)
x=28
Vậy x=28
b)x-13=-13-14
x-13=-27
x =-14
Vậy x=-14
HỌC TỐT!
a, 71 - ( 33 + x ) = 26
=> 33 + x = 71 - 26
=> 33 + x = 45
=> x = 45 - 33
=> x = 12
b, 140 : ( x - 8 ) = 7
=> x - 8 = 140 : 7
=> x - 8 = 20
=> x = 20 + 8
=> x = 28
c, 4 ( x + 41 ) = 22 . 102
=> 22 ( x + 41 ) = 202
=> x + 41 = 202 : 22
=> x + 41 = 102
=> x + 41 = 100
=> x = 100 - 41
=> x = 59
d, 11 ( x - 9 ) = 77
=> x - 9 = 77: 11
=> x - 9 = 7
=> x = 7 + 9
=> x 16
\(a.71-\left(33+x\right)=26\)
\(33+x=45\)
\(x=12\)
\(b.140:\left(x-8\right)=7\)
\(x-8=20\)
\(x=28\)
\(c.4\left(x+41\right)=2^2.10^2\)
\(4\left(x+41\right)=4.100\)
\(4\left(x+41\right)=400\)
\(x+41=100\)
\(x=59\)
\(d.11\left(x-9\right)=77\)
\(x-9=7\)
\(x=16\)
x-(17-8) = 5+(10-3x)
x-9=5+10-3x
x+3x=5+10+9
x+3x=24
4x=24
x=24/4
x=6
vậy x=6
a) x - (-3) + 5 = -8 c) |x| - 5 = 0
=> x + 3 + 5 = -8 => |x| = 5
=> x + 8 = -8 => \(\orbr{\begin{cases}x=5\\x=-5\end{cases}}\)
=> x = -8 - 8 Vậy ...
=> x = -16
b) 20 - (3 - x) = 2x - 4 d) |5 - x| + (-4) = 8
=> 20 - 3 + x = 2x - 4 => |5 - x| = 8 + 4
=> 17 + x = 2x - 4 => |5 - x| = 12
=> 17 + 4 = 2x - x => \(\orbr{\begin{cases}5-x=12\\5-x=-12\end{cases}}\)
=> x = 21 => \(\orbr{\begin{cases}x=-7\\x=17\end{cases}}\)
Câu 1 : ( 53 - 76 ) - [ - 76 - ( -53 ) ]
= ( 53 - 76 ) + 76 - 53
= ( -76 + 76 ) + ( 53 - 53 )
= 0 + 0
= 0
Câu 2 : 7 - x = 8 - ( -7 )
7 - x = 8 + 7
7 - x = 15
x = 7 - 15
x = 8
x - 8 = ( -3 ) - -8
x - 8 = -11
x = -11 + 8
x = -3
Câu 3 :
3 - 2 + x = 5
1 + x = 5
x = 5 - 1
x = 4
Câu 4 "
a + x = b
a = b - x
a - x = b
x = a - b
a) \(7-x=8-\left(-7\right)\)
\(\Leftrightarrow-x=8+7-7=8\)
\(\Leftrightarrow x=-8\)
Vậy x = - 8
b) \(x-8=\left(-3\right)-8\)
\(\Leftrightarrow x=\left(-3\right)-8+8\)
\(\Leftrightarrow x=-3\)
Vậy x = - 3
a) 7 - x = 8 - (-7)
\(\Rightarrow\) 7 - x = 8 + 7
\(\Rightarrow\) -x = 8
\(\Rightarrow\) x = -8
Vậy: x = -8