2. \(7\left(-3\right)-5\left(3-x\right)=11-5\)
\(\Leftrightarrow-21-5\left(3-x\right)=6\)
\(\Leftrightarrow-5\left(3-x\right)=27\)
\(\Leftrightarrow3-x=-\frac{27}{5}\)
\(\Leftrightarrow x=-\frac{42}{5}\)
Vậy \(x=-\frac{42}{5}\)
Khó quá :((
Các câu hỏi tương tự
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
Đọc tiếp
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
Bài 1:thực hiện phép tính(hợp lí nếu có thể):1, -5/12 x 2/11 + -5/12 x 9/11 + 5/122, -3/5 : 7/5 - 3/5 : 7/5 + 2 3/53, 1/2+ 3/4 - ( 3/4 - 4/5)4, 2/3 + 1/3 x ( -4/9 + 5/6)5, -3/7 x 5/9 + 4/9 x -3/7 + ( - 2022) ^ 06,0,75 - ( 2 1/3 + 0,75) + 3 ^ 2 x ( -1/9)7, 2 6/7 x [(-7/5 - 3/2 : -5/-4) + ( 3/2)^2]8,2/7 + 5/7 x ( 3/5 - 0,25 ) x ( -2)^2 + 35%9, 1 13/15 x 0,75 - ( 11/20 + 25%): 1 2/510, ( -2,4 + 1/3 ) : 3 1/10 + 75% : 1 1/211.5/3 - 5/7 + 5/9 / 10/3 - 10/7 + 10/9
Đọc tiếp
Bài 1:thực hiện phép tính(hợp lí nếu có thể):
1, -5/12 x 2/11 + -5/12 x 9/11 + 5/12
2, -3/5 : 7/5 - 3/5 : 7/5 + 2 3/5
3, 1/2+ 3/4 - ( 3/4 - 4/5)
4, 2/3 + 1/3 x ( -4/9 + 5/6)
5, -3/7 x 5/9 + 4/9 x -3/7 + ( - 2022) ^ 0
6,0,75 - ( 2 1/3 + 0,75) + 3 ^ 2 x ( -1/9)
7, 2 6/7 x [(-7/5 - 3/2 : -5/-4) + ( 3/2)^2]
8,2/7 + 5/7 x ( 3/5 - 0,25 ) x ( -2)^2 + 35%
9, 1 13/15 x 0,75 - ( 11/20 + 25%): 1 2/5
10, ( -2,4 + 1/3 ) : 3 1/10 + 75% : 1 1/2
11.5/3 - 5/7 + 5/9 / 10/3 - 10/7 + 10/9
A= ( 6 : 3/5 - 1 1/6 x 6/7 ) : ( 4 1/5 x 10/11 + 5 2/11 )
B= ( 1 - 1/2 ) x ( 1- 1/4 ) x ... x ( 1 - 1/2003 ) x ( 1 - 1/2004 )
C= 5 9/10 : 3/2 - ( 2 1/3 x 4 1/2 - 2 x 2 1/3 ) : 7/4
1)5x+2(x+1/2)=7
2)8x-3(x+2)=9
3)5(x-2)+3(x-1)=19
4)7(x-3)-2x-5=11
5)6x+3-2(x-5)=30
6)8(x-1/8)-5(x-1/5)=10
7)13x-5-2(x+3)=1
8)4(x-2)-2(x-1)=12
9)6x-13-2-(x×5)=7
10)7(x-5)-3(x+5)=30
tính
(2^2+1) x (2^2 -1) x (2^4 - 4^2)
(7^3+7^5) x (5^4+5^6) x (3^3 x 3-9^2)
2^2x5 [( 5^2 + 2^3) : 11] - 2^4 + 2 x 10^3
tìm x thuộc Z biết:
1) 2(4x-8)-7(3+x)=[-4](3-2)
2) 12(x-4)+6(x-2)-16(x+3)=7[-4]
3) 4(x-5)-7(5-x)+10(5-x)=-3
4) -3[x+5]=15(-3)+7(-3)
5) 4[x-7]-3(-5)=-2[x-7]-10
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
tìm x biết :
a) 3/4 . x + 1/2 =3/5
b) x - 5/4 = 1/3 - 3/4 .x
c) -2/3 . ( x - 1/4 ) = 1/3 . ( 2x-1)
Tìm x biết:a) 10/x = -15/9; b) x/9 = -11/5 : 0,6; c) -7/8 - 2x = -3/4; d) (x-1/2):1/3+5/7=9và5/7; e)1/15.x+4/5.x=5và1/5; f) -1/3<x/6<1/2(x thuộc Z); h) 3/5+2/5:x=-1/4;i) 4 và 3/4x - 3 và 1/2=5/4; k)9/4.(1/3x-1/2)=4và1/2
1) x +1/2 =5/3. 2) 3/5 - x =1/3. 3) 3/4 + x =7/2
4) x - 4/3 =7/9. 5)x - 5/6 = 7/3. 6)x- 1/5 =9/10