a) x - 2/3 = 4/5 . 3/4
x - 2/3 = 3/5
x = 3/5 + 2/3
x = 19/15
b) x - 11/18 = 0,2 + 7/18
x = 0,2 + 7/18 + 11/18
x = 0,2 + 1
x = 1,2
c) -3/8 x + 3/10 = 4/5
-3/8 x = 4/5 - 3/10
-3/8 x = 1/2
x = 1/2 : (-3/8)
x = -4/3
d) 3/5 + 2/5 x = 1
2/5 x = 1 - 3/5
2/5 x = 2/5
x = 2/5 : 2/5
x = 1
Tìm x biết :
a, 4.(18 - 5x) - 12.(3x - 7) = 15.(2x - 16) - 6(x + 14)
b, 5.(3x + 5) - 4.(2x - 3) = 5x + 3.(2x + 12) + 1
c, 2.(5x - 8) - 3.(4x - 5) = 4.(3x - 4) + 11
d, (3x + 2)(2x + 9) - (x + 2)(6x + 1) = (x + 1) - (x - 6)
e, (8x - 3)(3x + 2) - (4x + 7)(x + 4)= (2x + 1)(5x - 1) - 33
Tìm x biết:
a) 4(18-5x) - 12(3x-7) = 15(2x-16) - 6(x+14)
b) 5(3x+5) - 4(2x-3) = 5x+3(2x+12)+1
c)2(5x-8) - 3(4x-5) = 4(3x-4) + 11
d) 5x-3 {4x-2 [4x-3(5x-2)]}=182
bài 2 . thực hiện phép tính
a. -1,75-(-1/9-2 1/18)
b. -1/12- (2 5/8-1/3)
c. -5/6-(-3/8+1/10)
Bài 3 :tìm x ,biết :
a. 11/13-(5/42-x)=(-15/28-11/13)
b. x+1/3=2/5-(-1/3)
c. 3/7-x=1/4-(-3/5)
tìm x biết:
a)(2x+2)(2x-2)-4x(x+5)=8
b)(4x+5)(4x-5)-8x(2x-7)=11
c)(1/2x-3)(1/2x+3)-1/4x(x+5)=11/2
d)(3x+2)(3x-2)-4x(x+2-5x2=18
mn giải giúp mk bài này vs
1) Tính
a;11/125-17/18-5/7+4/9+17/14
b;1-1/2+2-2/3+3-3/4+4-1/4-3-1/3-2-1/2-1
c;26:[3:0,1/25*2+0,25*4/6,84:3,42
2)Tìm x,Biết
a)x+1/3=2/5-1/3
b)3/7-x=1/4-(-3/5)
c)11/33-(5/42-x)=-(15/28-11/3)
d)|x+4/5|-|-3,75|=-|-2,15|
B1:tìm x biết a, (-2+x^2)(x^2-2)(x^2-2)(x^2-2)(x^2-2)=1 b, (2x+3)(x-4)+(x-5)(x-2)=(3x-5)(x-4) c,(8x-3)(3x+2)-(4x+7)(x+4)=(4x+1)(5x-1) d, 2x^2+3(x-1)(x+1)=5x(x+1) e, (8-5x)(x+2)+4(x-2)(x+1)=(2+x)(2-x) f, 4(x-1)(x+5)-(x+2)(x+5)=3(x-1)(x+2)
Bài 1:
a,11/125-17/18-5/7+4/9+17/14
b,(7+7/5-2/3)-(4+4/5+3/8)+(3-3/5+2/3+3/8)
c,-13/25.5/32.23/-13.(-64)
Bài 2:
a,11/13-(3/42-x)=-(13/28-11/13)
b,x2/3x+5/7=3/10
c,x-21/13x+1/3=-2/3
Tìm x
a) |-2/11 + 3/22x|- 1/2 = 5/7
b) -7/8x - 5 3/4= 3
c) 2x + -2/7 - 7 = -11
d) 3/7 + x : 14/15= 1/2
Tìm X:
a, 3/7- (2/5 + X + 3/2) = 5/14 - /4/35 - (-11)/70 /
b,3/4(x-8) = 5/7.(4-1/2)
c,3/2 - 4(1/4 - x) = 2/3 - 7x
d,4.(1/2-x) - 5.(x-3/10) = 7/4
