x + x - (-15) = 25 - (-15)
A) x -(25-x)=x-15
B) x-8=-13-8
C) x-(-15)=5-(-19)
D) (x+35)=2x+15+(13-4)
E) 5-2x=15-(-9)-3x
G) x+135=3x-15
x+5.2-(32+16.3;16-15)=0
2448;[119-(x-6)=24
20-[7.(x-3)+4]=2
x;[(1800+600);30]=560;(315-35)
[(1250-25);15];x=(450-60);130
9 - 25 = ( 7 - x ) - ( 25 + 7 )
x - 2 + 4 = 10 ( x - 2 dấu giá trị tuyệt đối )
3x + 9 - 15 = 27 ( 3x + 9 dấu giá trị tuyệt đối )
Tìm x, biết:
a) 2 . ( x - 5 ) - 17 = 25
b) 3 . ( x + 7 ) - 15 = 27
tìm x , biết
1) x : 2 1/3 = -1,5 4) x - 15% = 1/3
2) 2,5 . x = 11/15 5) ( 3/7x + 1 ) : ( -4 1/7 )
3) 30%x = -1,2 6) x - 35%x = 1/25
chú ý : / là phần nha
Bai 1 : Tinh a) 24 - (-15) - 2 b) (-85) + 10 - (-85) - 50 c) 71 - (-30) - (+18) + (-30)
d) -(30) - (+37) + (+37) + (-85) e) (35-815) - (795-65) g) (2002-79+15) + (-79+15)
h) -(515-80+91) - (2003+80-91)
Bai 2: Tim x,biet a) 25 - (30+x) = x - (27-8) b) (x-12) - 15 = (20-17) - (18+x) c) 15 - x = 7 - (-2) d) x - 35 = (-12) - 3 e) I5-xI - 26 = - 15
Tim x
A, 2x - ( x + 25 ) - 75 = -12
B, ( x - 12 ) - 15 = ( 120 - 18 ) - (20 + x )
C, 17 - { - x - [ - x - ( - x )] } = -16
D, x - { [ - x + ( x +3 ) ] - [ ( x +3) - ( x - 2) ] }= 0
1. Tìm x
a, 35÷ x
b, x÷ 25 và x< 100
c, 15÷ x
d, x+ 16 ÷ x+1