7.(25.x)-20=190
7.(25+x)-20=190
7 .( 25 +x ) - 20 = 190
7 . ( 25 + x ) = 210
25 + x = 210 : 7
25 + x = 30
x = 30 - 25
x = 5
Tìm x
7.(x+52)-20=190
Đề:......
<=> 7. (x + 25) = 210
<=> x + 25 = 210 : 7
<=> x + 25 = 30
<=> x = 5
Vậy x = 5
Tìm x :
7 ( x + 52 ) - 20 = 190
\(7\left(x+5^2\right)-20=190\)
\(7\left(x+25\right)=190+20\)
\(7\left(x+25\right)=210\)
\(x+25=210:7\)
\(x+25=30\)
\(x=30-25\)
\(x=5\)
Vậy \(x=5\)
7 ( x + 52 ) - 20 = 190
7(x+5^2)-20=190
7(x+25)-20=190
7(x+25) =190+20
7(x+25) =210
x+25 =210/7
x+25 =30
x =30-5
x =5
Vậy x=5
\(7\left(x+5^2\right)-20=190\)
\(7\left(x+25\right)=190+20\)
\(7\left(x+25\right)=210\)
\(x+25=210:7\)
\(x+25=30\)
\(x=30-25\)
\(x=5\)
Vậy x=5
7.(x + 52) - 20 = 190
7.(x + 25) = 190 + 20
7.(x + 25) = 210
x + 25 = 210 : 7
x + 25 = 30
x = 30 - 25 = 5
Vậy x = 5
Ủng hộ mk nha !!! ^_^
7 [ x + 5 ] - 20 = 190 155 - 10 [ x + 1 ]= 55
6 [ x + 2 mũ 3 ] + 40 = 100 15x - 133 = 17
90 [ x + 2 ] = 45 14x + 54= 82
17x - 20 =14
A, 7[x + 5] - 20 = 190
7x + 35 - 20 = 190
7x + 15 = 190
7x = 175
x = 25
B, 155 - 10[x + 1] = 55
155 - 10x - 10 = 55
-10x + 90 = 55
-10x = -35
x = 3.5
C, 6[x + 2^3] + 40 = 100
6[x + 8] + 40 = 100
6x + 48 + 40 = 100
6x + 88 = 100
6x = 1
2 x = 2
D, 15x - 133 = 17
15x = 150
x = 10
E, 90[x + 2] = 45
90x + 180 = 45
90x = -135
x = -1.5
F, 4x + 54 = 82
4x = 28
x = 7
G, 17x - 20 = 14
17x = 34
x = 2
Bài 2.Tìm x
a,72-(4x+15)=45
b,7.(x+5^2)-20=190
a, 72-(4.x+15)=45 con cau b khong lam dc
4.x+15=72-45
4.x+15=27
4.x=27-15
4.x=8
x=8:4
x=2
a, 72-(4x+15)=45
4x+15=72-45
4x+15=27
4x =27-15
4x =12
x =3
b,7.(x+5^2)-20=190
7.(x+25) =190+20
7.(x+25) =210
x+25 =210:7
x+25 =30
x =30-25
x =5
chúc bạn học tốt nhé!
a,72-(4x+15)=45
\(4x+15=72-45\)
\(4x+15=27\)
\(4x=27-15\)
\(4x=12\)
\(\Rightarrow x=3\)
b,7.(x+5^2)-20=190
\(7.\left(x+5^2\right)=190+20\)
\(7.\left(x+5^2\right)=210\)
\(\Rightarrow x+25=30\)
\(\Rightarrow x=5\)
HỌC TỐT
22 (x+32)-5 =55
7(x+52) - 20 = 190
a) ta có: 4(x+32)-5=55 nên 4(x+32)=60, nên x+32=60/4=15
Mà 32=9 nên x=4
b) ta có 7(x+52)=210 nên x+52=30 . x+25=30 nên x=5
22 (x+32 ) -5 = 55
7 (x+52 ) - 20 = 190
22(x+32)-5=55
7(x+52)-20 =190
22( x + 9 ) - 5 = 55
22( x + 9 ) = 55 + 5 = 60
x + 9 = 60 : 4 = 15
x = 15 - 9 = 6
7( x + 52 ) - 20 = 190
7( x + 52 ) = 190 + 20 = 210
x + 52 = 210 : 7 = 30
x = 30 - 52
x = -22