a) \(-12\left(x-5\right)+7\left(3-x\right)=5\)
\(\Rightarrow-12x+60+21-7x=5\)
\(\Rightarrow-19x+81=5\)
\(\Rightarrow-19x=-76\)
\(\Rightarrow x=4\)
Vậy \(x=4\)
b) \(30\left(x+2\right)-6\left(x-5\right)-24x=100\)
\(\Rightarrow30x+60-6x+30-24x=100\)
\(\Rightarrow0x+90=100\)
\(\Rightarrow0x=10\)(Vô lí)
Vậy không có x
Bài 22 :
a. - 12 . ( x - 5 ) + 7 . ( 3 - x ) = 5
b. 30 . ( x + 2 ) - 6 . ( x - 5 ) - 24x = 100
Bài 23 :
a. xy - 3x = - 19
b. 3x + 4y - xy = 16
Hộ cái
Jup nha mn nhanh gọn lẹ đg cần gấp
Tinm x E Z,bt:
a) x-14=3x+18 ;è)(x-5)-3(x-4) =-6+15(-3)
b)(x+7)(x-9)=0 ;g)|2x-5|-7=22
c)x(x+3)=0 ; h)-12(x-5)+7(3-x=5
d)(x-2)(5-x)=0 ;i)30(x+2)-6(x-5)-24x=100
Tìm x thuộc Z biết
a/ (x-3)+(x-2)+(x-1)+...+10+11=11
b/ 30(x+2)-6(x-5)-24x=100
c/ -12(x-5)+7(x-3)=5
Tìm x biết: a) – 12(x – 5) + 7(3 – x) = 5 b) 30(x + 2) – 6(x – 5) – 24x =100
-12(x-5)+7(3-x)=5 30(x+2)-6(x-5)-24x=100
(x+1-5)+7(3-x)=5 30(x+2)-6(x-5)-24x=100
(x+1)+(x+3)+(x+5)+........+(x+99)=0
Tìm x biết:
a, -12 (x-5)+7(3-x) = 5
b, 30(x+2)- 6(x-5) - 24x = 100
tìm x biết:
a.-12(x-5)+7(3-x)=5
b.30(x+2)-6(x-5)-24x=100
Tìm x
a, -12.(x-5)+7.(3-x) = 15
b, 30-(x+2)-6.(x-5)-24x=100
tìm x:
a) -12(x-5)+7(3-x)=15
b) 30(x+2)-6(x-5)-24x=100
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