Tìm x trong hình sau :
A B C 16 38 độ x
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a) 10-x-5=-5-7-11
=> 5 - x = -23
=> x = 28
b) |x| -3=0
=> |x| = 3
=> x = 3 hoặc x -3
c) ( 7-|x| ) .(2x-4)=0
=> 7 - |x| = 0 hoặc 2x - 4 = 0
=> |x| = 7 hoặc 2x = 4
=> x = 7 hoặc x = - 7 hoặc x = 2
c)2+3x=-15-19
=> 2 + 3x = -34
=> 3x = 36
=> x = 12
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Câu 1:
a) 25-(30+x) = x-(27-8)
25-30-x = x-19
-5-x = x-19
(-5)+19 = x+x
14 = 2x
x = 7
Vậy x = 7
b) (x-12)-15 = (20-7)-(18+x)
x-12-15 = 13-18-x
x-(12+15)= -5-x
x-27 = -5-x
x+x = -5+27
2x = 22
x = 11
Câu 2:
a) 4573+46-4573+35-16-5
= (4573-4573)+(46-16)+(35-5)
= 0+30+30
= 60
b) 32+34+36+38-10-12-14-16-18
= (32-12)+(34-14)+(36-16)+(38-18)-10
= 10+10+10+10-10
= 30
1, a) 25 - (30 + x) = x - (27 - 8)
25 - 30 - x = x - 27 + 8
-x - x = -27 + 8 - 25 + 30
-2x = -14
x = -14 : (-2)
x = 7
b) (x - 12) - 15 = (20 - 7) - (18 + x)
x - 12 - 15 = 20 - 7 - 18 - x
x + x = 20 - 7 - 18 + 12 + 15
2x = 22
x = 22 : 2
x = 11
2, a) 4573 + 46 - 4573 + 35 - 16 - 5
= (4573 - 4573) + (46 - 16) + (35 - 5)
= 0 + 30 + 30
= 60
b) 32 + 34 + 36 + 38 - 10 - 12 - 14 - 16 - 18
= (32 - 10) + (34 - 12) + (36 - 14) + (38 - 16) - 18
= 22 + 22 + 22 + 22 - 18
= 22 x 4 - 18
= 88 - 18
= 70
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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
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vì a//b nên A+y=180(trong cùng phía
=>y=180-A=180-120=60
vì a//b nên x=C=70(so le trong)
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2a) x . 45 - x . 38 = 1505
x (45 - 38) = 1505
x . 7 = 1505
x = 1505 : 7
=> x = 215
b) 128 . x - x . 16 - 12 . x = 520800
x (128 - 16 - 12) = 520800
x . 100 = 520800
x = 520800 : 100
=> x = 5208
1.b (ko chắc )
2.
a)x.45-x.38=1505
x.(45-39)=1505
x.7=1505
x=1505:7
x=215
vậy x=215
b)128.x-x.16-12.x=520800
x.(128-16-12)=520800
x.(112-12)=520800
x.100=520800
x=520800:100
x=5208
vậy x=5208