tim x biet (x+1) + (x+4)+(x+7)+...+(x+28) = 156
1) 168 - ( 18 - 2x ) x 12 = 120
2) [ 75 + ( 16 - x ) ] x 2 = 156
3) 124 - 24 x ( 3x - 16 ) = 76
4) [ ( 10 - x ) x 2 + 5 ] : 3 - 2 = 3
5) [ 80 + ( 62 - x ) ] : 17 - 7 = 1
6) 65 - ( 5x - 70 ) : 2 = 50
7) 504 : 9 136 - 2x ) + 4 = 32
8) ( 13x - 28 ) x 15 - 5 x 23 = 320
Mình cần gấp ạ !!!
Tìm x, biết:
a)2+4+6+...+2x=156
b) /x+1/+/x-2/+/x+7/=5x-10
( x + 1 ) + ( x + 4 ) + ( x+7 ) + ......+ ( x + 28 )
( x + 1 ) + ( x + 4 ) + ( x+7 ) + ......+ ( x + 28 )
( x + 1 ) + ( x + 4 ) + ( x+7 ) + ......+ ( x + 28 )
bài 13: tìm x biết
a. 124 + (118 - x) = 217
b. 156- (x + 61) = 82
c. 219 - 7(x + 1) = 100
d. (3x - 6). 3 = 3^4
e. 231 - (x - 6) = 1339 : 13
(x +1)+ (x=4)+(x+7)+...+(x+28)=155
(x+1)+(x+4)+(x+7)+.....+(x+28)=115