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
b1 :
5 , 31 + 62 x 20 + 31 x 59
6, -19 + 38 x 22 + 31 x 59
7, 54 ( -11 - 32 ) - 32 (89 - 54 )
8,2018 x 31 - 2018 ( -19 ) + 2018 x 50
9, 16 x 34 - (-16 ) x 21 + 55 x 16
10 , 29 x 63 - 63 x 31 - 63 x 98
ai làm hết mkcho 10 tick trong 1 buổi tối
2 x -15=25
63:x=21
x-8=96
120-(x -3)=35
35-5(x-2)=15
(X-9)-20=19
2782:(216-x-3) =15
130-30(x-2)=100
2 x -15=25
63:x=21
x-8=96
120-(x -3)=35
35-5(x-2)=15
(X-9)-20=19
782:(216-x-3) =15
130-30(x-2)=10
Tìm x, biết
a) (x-14)-20 = 0;
b) 25 - ( 2.x +10) = 5;
c) 315 - (135 - x) = 215;
d) 128 + ( 202 - x ) = 330;
e) x - 320:32 = 25.16;
f) ( x - 120) .9 = 450.
So sánh :
a= 2 / 60 x 63 + 2 / 63 x 66 + 2 / 66 x 69 + ........... + 2 / 117 x 120 + 2 / 2011
và b= 5 / 40x 44 + 5 / 44 x 48 + 5 / 48 x 52 + ......... + 5 / 76 x 80 + 5 / 2011
Tính nhanh :
a/ 320 x 63 - 16 x 20 + 32 x 370
b/ 35 x 61 + 215 x 5 + 35 x 39 + 57 x 25
c/ 34 x 24 - 94 x 6 + 83 x 48 - 47 x 88
Tìm số nguyên x biết:
1, -x +(-53) =(-42) - 41
2. -12 - x= -32 +19
3.453+x = -443+(-199)
4. -12-x = -32 +19
5. 32.(-2) +x = -120 -5.(-85)
6. -2x + 15.(-4) = 21.(-8) -12
Tìm x, biết
a) 21x = 63;
b) 32. |x| = 96;
c) 11x + 5 = 60;
d) 2 . |x| + 5 = 32 - 13.