\(-7.\left(5-x\right)-2.\left(x-10\right)=15\)
\(-35+7x-2x+20=15\)
\(-15+5x=15\)
\(5x=15+15\)
\(5x=30\)
\(x=6\)
Vậy \(x=6\)
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Tìm x biết
1) 2.(x +5)+3.(x+7)41. 6) 7. (x -1)+5.(3-x)11.x-10
2) 5. ( x +6 ) +2.(x-3)38. 7) 4. (2+x)+3(x-2)12
3) 7.(5+x)+2.(x-10)15. 8) 5. ( 2+x) +4.(3-x)10x-15
4) 3. (x+4)+(8-2.x) 22. 9) 7.(x-2) +5.(3-x)11x-6
5) 4. (x+5)+3.(7-x)49. 10) 5.(3-x)+5.(x+4)6+4x
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Tìm x biết
1) 2.(x +5)+3.(x+7)=41. 6) 7. (x -1)+5.(3-x)=11.x-10
2) 5. ( x +6 ) +2.(x-3)=38. 7) 4. (2+x)+3(x-2)=12
3) 7.(5+x)+2.(x-10)=15. 8) 5. ( 2+x) +4.(3-x)=10x-15
4) 3. (x+4)+(8-2.x) =22. 9) 7.(x-2) +5.(3-x)=11x-6
5) 4. (x+5)+3.(7-x)=49. 10) 5.(3-x)+5.(x+4)=6+4x
1. -2/9 x 15/17 + -2/9 x 2/17
2. -5/3 x 6/5 + -7/9 x 3/10
3. 15/20 x 7/5 + -9/7 x -6/4
4.-25/13 x 5/19 + -25/13 x 14/19
5 -7/13 x 13/5 + -9/7 x 5/3
6. 27/35 x 5/9 - 2/7 x -7/5
7. 10/13 x 13/5 + {-9/5} x 10/3
8. 100/27 x 9/20 + 40% x 5/3
9. 1,5 x 5/12 + 1/4 x 3/4
10. 2 1/2 x 7/5 + {-9/10} x 2/3
11. X + 45% = 2 1/2 -5/3
12. 80% + X = -5/2 + 3/4
13. 4/25 - X =-5/2 + -3/10
1Tìm x biết
a,x+15=20-4x
b,17-x=7-6x
c,4.(x-5)-3.(x+7)= -19
d,-7.(5-x)-2.(x-10)=15
e,-5.(2-x)+4.(x-3)=10.x-15
ai làm nhanh nhất mình sẽ tích cho
Tìm x, biết:
a) 5.2²+(x+3)=5²
b)2³+(x-3²)=5³-4³
c)4.(x-5)-2³=2⁴.3
d)5.(x+7)-10=2³.5
e)7²-7.(13-x)=14
f)5x-5²=10
g)9x-2.3²=3⁴
h)10x+2².5=10²
i)125-5.(4+x)=15
j)2⁶+(5+x)=3⁴
Tìm x:
1)!x!=5
2)!x!=5+7-10
3)!x!=-5-!-10! +15
4)!x!=-(-12)+(-15)+8
5)!x-1!=3
6)!x+2!=4
7)!x-5!=2-5+4
8)!x+4!=-(-3)+(-8)+10
9)!x+5!-5=7
Mỗi dấu ! tương ứng với dấu của trị tuyệt đối
a) x - = b) . c)
) : e) f) .
x
x
d x x x x x
3 13 2 4 3 7 2
1 3
5 25 3 5 10 15 3
4 5 1 7 2 11 1 1
3 15 1 3
5 7 6 5 5 2 3 2
(-15) . x = -45
(+2) . x = -16
(-15) . x = 10.(-40)-5
(-3) . x = 2.(-7)+4
tìm X biết:
a,-7.(5-X)-2.(X-10)=15
b,10.(X-7)-8.(X+5)=6.(-5)+24
Tìm X biết:
a,-7.(5-X)-2(X-10)=15
b,10(X-7)-8(X+5)=6(-5)+24
tìm x:
a) -7(5-x)-2(x-10)=15
b) 4(x-5)-3(x+7)= -19
c) 4(2-x)+3(x-5)=14
d) -7(3x-5)+2(7x-14)=28
e) 5(4-x)-7(2-x)=-2
f) 5(x-7)+10(3-x)=20
g) 7(5-x)+5(x-2)=15
h) 5(x-6)-2(x+3)=12
i) 3(x-4)-(8-x)=12
giúp mk vs