a/=> 16x - 2 = 78
=> 16x = 80
=> x = 5
b/ => [ 7(x - 3) + 4 ] : 2 = 20
=> 7(x - 3) + 4 = 40
=> 7(x - 3) = 36
=> x - 3 = 36/7
=> x = 57/7
a/=> 16x - 2 = 78
=> 16x = 80
=> x = 5
b/ => [ 7(x - 3) + 4 ] : 2 = 20
=> 7(x - 3) + 4 = 40
=> 7(x - 3) = 36
=> x - 3 = 36/7
=> x = 57/7
2x+3x=57:5
7.(42- x) = 53+134
X+18÷32=5×42
a, 201415.(2.x - 60) =201416
b, x+18÷32=5.42
C,7.(42 - x)=53+134
Giúp tớ nhanh vs ạ
Tìm x thuộc N, biết :
[(46-32)^2-(54-42)^2].2.x-1872=0
(x-7)^7=(c-7)^8
1+2^3+3^3-4^2.x=20
a, 2.x + 7 = 15
b, 25 – 3.(6 – x) = 22
c, [(2x – 11) : 3 + 1].5 = 20
d, (25 – 2x)3 : 5 – 32 = 42
e, 2 . 3x = 10 . 312 + 8 . 274
g, x – 12 = (–8) + (–17)
h, 7 – 2x = 18 – 3x
i, 3(x + 5) – x – 11 = 24
a ) - 7 -15 + 30
b )10 x 23 - 10 x (-17)c )21 x 3 -7 x[(-32) + 18]d )-20 - [ 10 x (4 mũ 3 - 54) x 5 mũ 2 + 2 mũ 4]Tính hợp lí các tổng sau:
1) 1+2+3+...+n
2) 2+4+6+...+2n
3) 1+3+5+7+...+(2n+1)
4) (125 x 37 x 32):4
5) 2 x 3 x 12 + 4 x 6 x 42 + 8 x 27 x 3
a) ( x - 25 ) - 110 = 0
b) 124 + ( 118 - x ) = 142
c) 124 - ( 3x + 22 ) = 42
d) x - 32 : 16 = 18
e ) ( x - 32 ) : 16 = 18
f) 294 : ( 19 - 2.x ) = 42
Tim x:42—(2×x+32)+18×3bang 6
1. x - 8 +32= 68
2. x +8+32=68
3. 98-x +34=43
4. 98+x-34=43
5. x :5:4=800
6. 18+x=384:8
7. (84,6-2 x x):3,02= 5,1
8. x x5= 120:6
9. (15x 24-x) :0,25= 100:0,25
Giúp tớ với tìm x : x- -18/54=7/9(âm 18) -14/42-x=-4/7