Tìm x biết -4(2x+9)-(-8x+3)-(x+13)=0
Tìm các số nguyên x biết:
-4( 2x+9 )-( -8x+3 )-( x+13 ) = 0
\(-4\left(2x+9\right)-\left(-8x+3\right)-\left(x+13\right)=0\)
\(-8x-36+8x-3-x-13=0\)
\(-x-52=0\)
\(x=-52\)
tìm x
a)(x+6)^2-x(x+9)=0
b)6x(2x+5)-(3x+4)(4x-3)=9
c)2x(8x+3)-(4x+1)=13
d)(x-4)^2-x(x+4)=0
e)(x-2)^2-(2x+3)(x-2)=0
a) \(\left(x+6\right)^2-x\left(x+9\right)=0\)
\(\Leftrightarrow\)\(x^2+12x+36-x^2-9x=0\)
\(\Leftrightarrow\)\(3x+36=0\)
\(\Leftrightarrow\)\(x=-12\)
Vậy...
b) \(6x\left(2x+5\right)-\left(3x+4\right)\left(4x-3\right)=9\)
\(\Leftrightarrow\)\(12x^2+30x-12x^2-7x+12=9\)
\(\Leftrightarrow\)\(23x+12=9\)
\(\Leftrightarrow\)\(x=-\frac{3}{23}\)
Vậy
c) \(2x\left(8x+3\right)-\left(4x+1\right)=13\)
\(\Leftrightarrow\)\(16x^2+6x-4x-1=13\)
\(\Leftrightarrow\)\(16x^2+2x-14=0\)
\(\Leftrightarrow\)\(8x^2+x-7=0\)
\(\Leftrightarrow\)\(\left(x+1\right)\left(8x-7\right)=0\)
\(\Leftrightarrow\)\(\orbr{\begin{cases}x=-1\\x=\frac{7}{8}\end{cases}}\)
Vậy
d) \(\left(x-4\right)^2-x\left(x+4\right)=0\)
\(\Leftrightarrow\)\(x^2-8x+16-x^2-4x=0\)
\(\Leftrightarrow\)\(-12x+16=0\)
\(\Leftrightarrow\)\(x=\frac{4}{3}\)
Vậy
e) \(\left(x-2\right)^2-\left(2x+3\right)\left(x-2\right)=0\)
\(\Leftrightarrow\)\(x^2-4x+4-2x^2+x+6=0\)
\(\Leftrightarrow\)\(-x^2-3x+10=0\)
\(\Leftrightarrow\)\(\left(2-x\right)\left(x+5\right)=0\)
\(\Leftrightarrow\)\(\orbr{\begin{cases}x=2\\x=-5\end{cases}}\)
Vậy
Tìm sồ nguyên x biết:
a) -4.(2x+9)-(-8x+3)-(x+13)=0
b) 7x.(2+x)-7x.(x+3)=14
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a) -4.(2x+9)-(-8x+3)-(x+13)=0
-8-36+8x-3-x-13=0
-x-52=0
x=-52
b) 7x.(2+x)-7x.(x+3)=14
7x.(2+x-x-3)=14
7x.(-1)=14
7x=14:(-1)
7x=-14
x=(-14):7
x=-2
Tìm x, biết :
-4(2x + 9) - (-8x + 3 ) -( x - 13) = 0
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\(-4\left(2x+9\right)-\left(-8x+3\right)-\left(x-13\right)=0\)
\(-8x-36+8x-3-x+13=0\)
\(-x-26=0\)
\(x=-26\)
-4(2x + 9) - (-8x + 3 ) -( x - 13) = 0
- 8x - 36 + 8x - 3 - 13 = 0
-x - 26 = 0
x = -26
k nha pizza
-4.(2x+9)-(-8x+3)-(x+13)=0
\(\Leftrightarrow-8x-36+8x-3-x-13=0\)
\(\Leftrightarrow-8x+8x-x=0+13+36+3\)
\(\Leftrightarrow-x=52\)
\(\Rightarrow x=-52\)
Vậy \(x=-52\)
-4. (2x + 9) - (-8x + 3) - (x + 13) = 0
-8x + (-36) - (-8x) - 3 - x - 13 = 0
-8x + (-36) + 8x + (-3) + (-x) + (-13) = 0
(-8x) + 8x + (-36) + (-3) + (-13) + (-x) = 0
(-52) + (-x) = 0
-x = 0 + 52
-x = 52
x = -52
-4. (2x + 9) - (-8x + 3) - (x + 13) = 0
-8x + (-36) - (-8x) - 3 - x - 13 = 0
-8x + (-36) + 8x + (-3) + (-x) + (-13) = 0
(-8x) + 8x + (-36) + (-3) + (-13) + (-x) = 0
(-52) + (-x) = 0
-x = 0 + 52
-x = 52
x = -52
Bài 1: Thực hiện phép tính
a) (45-25).(-11)+29.(-3-17)
b) (36-6).(-5)+21.(-17-3)
Bài 2: Tìm x, biết:
a) -4.(2x+9)-(-8x+3)-(x-13)=0 b) 7x.(2+x)-7x.(x+3)=0
Trả lời
Bài 1:
a)(45-25).(-11)+29.(-3-17)
=20.(-11)+29.(-20)
=20.(-11)+(-29).20
=20.[(-11)+(-29)]
=20.(-30)
=-600
b)(36-6).(-5)+21.(-17-3)
=30.(-5)+21.(-20)
=(-150)+(-420)
=-570
trả lời:
a,(45-25).(-11)+29.(-3-17)
=20.(-11)+29.(-20)
=20.(-11)+(-29).20
=20.[(-11)+(-29).20
=20.(-30)
=-600
học tốt
tìm x :
-4(2x+9)-(-8x+3)-x+13
tìm x :
-4(2x + 9) - ( -8x + 3) = x - 13
\(-4\left(2x+9\right)-\left(-8x+3\right)=x-13\)
\(\Rightarrow-8x-36+8x-3-x+13=0\)
\(\Rightarrow-x-26=0\)
\(\Rightarrow-x=26\)
\(\Rightarrow x=-26\)
Vậy x = -26
tìm x
a)(x+6)^2-x(x+9)=0
b)6x(2x+5)-(3x+4)(4x-3)=9
c)2x(8x+3)-(4x+1)=13
d)(x-4)^2-x(x+4)=0
e)(x-2)^2-(2x+3)(x-2)=0