X × 186 - X × 38 = 4200
a) 1400 : 20 – ( 17 + x) = 20
b) 8 × ( x + 15 ) = 640
c. x x 62 + x x 38 = 4200
d. x x 186 - x x 86 = 3400 giúp mk với ạ
a) 1400 : 20 - (17 + x) = 20
70 - (17 + x) = 20
17 + x = 70 - 20
17 + x = 50
x = 50 - 17
x = 33
b) 8 \(\times\) (x + 15) = 640
x + 15 = 640 : 8
x + 15 = 80
x = 80 - 15
x = 65
c) x \(\times\) 62 + x \(\times\) 38 = 4200
x \(\times\) (62 + 38) = 4200
x \(\times\) 100 = 4200
x = 4200 : 100
x = 42
d) x \(\times\) 186 - x \(\times\) 86 = 3400
x \(\times\) (186 - 86) = 3400
x \(\times\) 100 = 3400
x = 3400 : 100
x = 34
X × 62 + X × 38 = 4200
X x 62 + X x 38 = 4200
X x (62+38)=4200
X=4200:100=42
Đáp số : 42
X x 62 + X x 38 = 4200
X x ( 62 + 38 ) = 4200
X x 100 = 4200
X = 4200: 100
X = 42
x*62+x*38=4200
Đưa về:
x^2+100=4200
=> x^2=4200:100=42
x^2=42=> x=\(\sqrt{42}\)
ko biết đúng hay sai đây
Tìm X biết: X x 62 + X x 38 = 4200
=> x . ( 62 + 38 ) = 4200
=> x . 100 = 4200
=> x = 4200 : 100
=> x = 42
\(x\times62+x\times38=4200\)
\(x\times\left(62+38\right)=4200\)
\(x\times100=4200\)
\(x=4200:100\)
\(x=42\)
\(x\times62+x\times38=4200\)
\(x\times\left(62+38\right)=4200\)
\(x\times100=4200\)
\(x=4200\div100=42\)
c. x x 62 + x x 38 = 4200 . Giúp mk với ạ , mk cảm ơn ☘✿❤☘
X x 62 + X x 38 = 4200
X x (62 + 38) = 4200
X x 100 = 4200
X = 4200 : 100
X = 42.
x*62+x*38=4200 ; giup toi voi
ai nhanh duoc like
x(62 + 38) = 4200
100x = 4200
x = 4200 : 100
x = 42
a, X x 62 + X x 48 = 4200 b, X x 186 - X x 86 = 3400
c, 216 : X + 34 : X = 10 d, 2125 : X - 125 : X = 100
a, X x 62 + X x 48 = 4200 b, X x 186 - X x 86 = 3400
c, 216 : X + 34 : X = 10 d, 2125 : X - 125 : X = 100
a)X x 62 + X x 38 = 4200 b) X x 186 - X x 86 = 3400
X x 62 + 38 =4200 X x 186 - 86 = 3400
X x 100 = 4200 X x 100 = 3400
X = 4200 : 100 X = 3400 : 100
X = 42 X = 34
c)X x 623 - X x 123 = 1000
X x 623 - 123 = 1000
X x 500 = 1000
X = 1000 : 500
X = 2
a, X x 62 + X x 48 = 4200 b, X x 186 - X x 86 = 3400
c, 216 : X + 34 : X = 10 d, 2125 : X - 125 : X = 100