2x - 3 = 7 3 . ( x + 7 ) = 15 24 . 3 . ( 5 - x ) = 27 15 + 4 . ( x - 2 ) = 95
2x = 3 + 7 x + 7 = 15 : 3 3 . ( 5 - x ) = 27 : 24 4 . ( x - 2 ) = 95 - 15
2x = 10 x + 7 = 5 3 . ( 5 - x ) = 1,125 4 . ( x - 2 ) = 80
x = 10 : 2 x = 5 - 7 5 - x = 1,125 : 3 x - 2 = 80 : 4
x = 5 x = ( -2 ) 5 - x = 0,375 x - 2 = 20
x = 5 - 0,375 x = 20 + 2
x = 4,625 x = 22
\(a,2x-3=7\)
\(2x=7+3\)
\(2x=10\)
\(x=10\div2\)
\(x=5\)
Zậy x = 5
\(b,3\cdot\left(x+7\right)=15\)
\(x+7=15\div3\)
\(x+7=5\)
\(x=5-7\)
\(x=-2\)
Zậy x = -2
\(c,24\cdot3\cdot\left(5-x\right)=27\)
\(5-x=27\div3\div24\)????
Chắc bn nhầm dấu + thành dấu * , nếu giải tjheo phép tính của mh thì nó là :
\(c,24+3\cdot\left(5-x\right)=27\)
\(3\cdot\left(5-x\right)=27-24\)
\(3\cdot\left(5-x\right)=3\)
\(5-x=3\div3\)
\(5-x=1\)
\(x=5-1\)
\(x=4\)(hợp lí nà )
Zậy .....
\(d,15+4\cdot\left(x-2\right)=95\)
\(4\cdot\left(x-2\right)=95-15\)
\(4\cdot\left(x-2\right)=70\)
\(\left(x-2\right)=80\div4\)
\(x-2=2\)
\(x=2+2\)
\(x=4\)
Zậy x = 4
Tk nhá !!! Mơn nhìu !!!
~ HOK TỐT ~
\(2x-3=7\)
\(2x=7+3\)
\(2x=10\)
\(x=10:2\)
\(x=5\)
Vậy \(x=5\)
\(3.\left(x+7\right)=15\)
\(x+7=15:3\)
\(x+7=5\)
\(x=5-7\)
\(x=-2\)
Vậy \(x=-2\)
\(24.3.\left(5-x\right)=27\)
\(72.\left(5-x\right)=27\)
\(72.5-72x=27\)
\(360-72x=27\)
\(72x=360-27\)
\(72x=333\)
\(x=\frac{37}{8}\)
Vậy \(x=\frac{37}{8}\)
\(15+4.\left(x-2\right)=95\)
\(4.\left(x-2\right)=95-15\)
\(4.\left(x-2\right)=80\)
\(x-2=80:4\)
\(x-2=20\)
\(x=20+2\)
\(x=22\)
Vậy \(x=22\)
1)
2x - 3 =7
2x =7+3
2x =10
x =10 :2
x = 5
2)
3 x (x+ 7) =15
x+7 =15 : 3
x +7 = 5
x = 5 - 7
x = -2
4)
15 + 4 x (x - 2) =95
4 x (x - 2) =95 -15
4 x (x - 2) = 80
x - 2 = 80 : 4
x - 2 = 20
x = 20 + 2
x = 22
3)
24 x 3 x (5 - x ) =27
3 x ( 5 - x ) =27 : 24
3 x (5 -x ) =1,125
5 -x = 1,125 : 3
5 - x = 0, 375
x = 5 - 0,375
x = 4,625
CHÚC BẠN HỌC TỐT !