45-(x-9)=-35
x-9=45-(-35)
x-9=80
x=80+9
x=89
\(45-\left(x-9\right)=-35\)
\(\Rightarrow x-9=45+35\)
\(\Rightarrow x-9=80\)
\(\Rightarrow x=80+9\)
\(\Rightarrow x=89\)
Tìm x thuộc Z:
1) -5x - (-3) = 13
2) 15 - ( x - 7) = -21
3) 45 - ( x - 9) = -35
4) | x - 2 | = 3
5) | x - 3| - 7 = 13
6) 72 - 3 . | x + 1 | = 9
7) 17 - ( 43 - | x | ) = 45
8) 3| x - 1| - 5 = 7
9) -12( x - 5) + 7( 3 -x) = 5
10) (x - 2) . ( x + 4 ) = 0
1, x-2=-6
2, -5x-(-3)=13
3, 15-(x-7)=-21
4, 3x+17=2
5, 45-(x-9)=-35
Mk đag cần gấp . Cảm ơn nhiều
Tìm x, biết:
45 - x / 1963 + 40 - x /1968 + 35 - x / 1973 + 30 - x / 1978 = - 4
2x +35 = x -27
2x - 41 = 3x = (-23)
4(x-3) - 3(x+5) = 45. (-2) -34
(x+3).(2x-18) = 0
Tính hợp lý:
1) 35 x 18 - 5 x 7 x 18
2) 45 - 5 x ( 12 + 9)
3) 24 x ( 16 - 5) - 16 x ( 24 - 5)
4) 29 x ( 19 - 13) - 19 x ( 29 - 13 )
5) 31 x (-18) + 31 x (-81) - 31
6) (-12) x 47 + (-12) x 52 + (-12)
7) 13 x ( 23 + 22 ) - 3 x ( 17 + 28 )
8) -48 + 48 x (-78) + 48 x (-21)
Tính nhanh:
13) \(\dfrac{45}{8}\left(\dfrac{4}{15}-\dfrac{7}{8}\right)+\dfrac{45}{8}\left(\dfrac{11}{15}+\dfrac{9}{8}\right)\)
14) \(\dfrac{15}{7}\left(\dfrac{49}{35}-\dfrac{27}{8}\right)-\left(\dfrac{2}{5}-\dfrac{27}{4}\right):\dfrac{7}{15}\)
Bài 2 : Tính nhanh
a)21.35-3.25.7
b)77-11.(30+7)
c)85.(35-27)-35(85-27)
d)47.(45-15)-47.(45+15)
a) 5/7 - x = -9/21
b) - x - 1/9 = -2/45
c) | x + 5/6 | = 11/24
Giúp mình vs:
Tìm x\(\in\)Z biết:
a)35-x=x-37
b)-19-x-17+1=x-45-20
c)-(20+x)-7=2x(-43)-(-2)
