[2x+5].7=343
2x+5=343:7
2x+5=49
2x=49-5
2x=44
x=44:2
x=22
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rut gon
a,3x(2x-7)-3x(4x-5)
b,(-7x+8)(-2x+3)-7x(2x-4)
c,(2x-3)(3x2-2x+4)-(2x-3)(3x+4)
d,(-2+7)(3x-6)-(4x-5)(2x-6)
A. -15(x + 2) + 7(2x - 3)= -50
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tim x
a, ( 3-2x ) . ( 1/3 - 1/2 ) ^2 + 4 . (7-5x ) = 9-2x
b, 7 - 3x 1 - 3x
_______ = ______
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bài 1 : tính
a) 1/7 : 5/17 - 3/2 . ( 1/6 - 7/12 )
b) 25/77 - ( 1/5 - 7/15 ) : 10/11 : |-3/4|
c) 4/7 + 15/4 - 11/4 + 3/7 - 1/2 + 1/3
bài 2 : tìm x
a) 3/4.x + 1/2 = -3/5
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tim x
-2x(6x-2)+3x(4x-7)=8
(7x-2)(2x+3)-(3x-5)(4x+6)=2x2-5
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TÌM X
a, 3 ( x + 2) - 7 ( 2x -1 ) = x - 5 ( 1 + x)
b, ( 2x - 1 ) - 3( 1 - 2x ) x - 8
2x +3 - (x + 1)= -5-7
tìm x
Giá trị x < 0 thỏa mãn :
\(\left|2x-\dfrac{1}{2}\right|+\dfrac{3}{7}=5\dfrac{3}{7}\)
23 tháng 2 2021 lúc 13:15
Tìm x :
a) \(1+3+5+7+...+\left(2x-1\right)=750\)
b) \(1+5+9+13+17+...+x=501501\)