a) x-3/8=11/10
x=11/10+3/8
x=118/80
b) x=-11/7:6/7
x=-77/42
Ai tích mk mk sẽ tích lại
x-3,8 = 3/10 + 4/5
=> x-3 = -1/2
=> x= -1/2 +3= 5/2
6/7 .x=-11/7
=> x= -11/7 : 6/7
=> x= -11/6
câu 1. tính giá trị các biểu thức sau:
a, 8.(-5).(-4).2 b, 1 3/7 + (-1/3 + 2 4/7) c, 8/5.2/3 + -5.5/3.5 d, 6/7+5/8 :5 - 3/16(-2)^2
câu 2.tìm x, biết:
a, 2x + 10=16 b, x - 1/3 = 5/4 c,2.x+3 1/3= 7 1/3 d,(2/11+1/3).x=(1/7-1/8).56
GIÚP VS! MAI TUI PHẢI NỘP RỒI! HELP ME
5) 6x – 5 = 3 + 4x 6) x – (17 – x) = x – 7
7) 9 – 25 = (7 – x) – ( 25 + 7) 8) 10 – 2.(4 – 3x) = - 4
9) (-12)2
.x = 56 + 10. 13x 10) 2x2
– 1 = 49
1) 1/1×2 + 2/2×4 + 3/4×7 + 4/7×11 +...+ 8/29×37 + 9/37×46 + 10/46×56
2) 4/3×7 + 4/7×11 + 4/11×15 + 4/15×19 + 4/19×23 + 4/23×27
3) 4/3×6 + 4/6×9 + 4/9×12 + 4/12×15 + ... + 4/99×102
a) 92/9 + 13/5 - 56/9
b) 58/7 - (31/9 + 30/7)
c) 2/3 + 1/3 x 9/4 - 13/12
d) 41/8 - 7/4 : 11/5
e) 478/19 : 5/4 - 668/19 : 5/4
f) 32/21 x 49/45 : 16/22 x 15/33
g) 2020x2018+9 / 2019x2020-2011.
Giup minh voi minh dang can gap!!!
bài 1:
a) 3/4 + -1/6
b)2/9 - 7/24
c)-8/15 . 9/56
d)-14/27 : -49/54
bài 2:
a)5/6 + x=-4/9
b)-8/15 - -1/6 . x=3/10
bài 3: tính bằng cách hợp lí
A= 11/19 . -24/37 - 14/19 . 11/37
(13-12+11-10)+( 9-8+7) – (6+5-4+3-2+1+x) = 7- ( -15+x ) - [ - ( 1-x )]
Bài 6 . Tìm x biết: 1) 58 + 7x = 100 AI LM ĐC MÌNH CHO 20 XU
2) 101 +(36 – 4x) =105
3) 3x – 7 = 28
4) ( x – 12):12=12
5) x – 56 : 4= 16
6) (3.x-2 4 ).73=2.74
7) 71 – (33 + x) = 26
8) = 7 10) 4(x + 41) = 400
9) 45 – (x + 9):2 = 6
11) 2. (x + 7) – 25 = 13
13) 2(x- 51) = 2.23 + 20
15) 450 : (x – 19) = 50
17) 10 - (x – 3): 2 = 72 – 1 10
19) 2x + 2 – 2 x = 48
8) 140 : (x – 12) 5(x – 9) = 350
14) 2x – 49 = 5.32
16) 200 – (2x + 6) = 43
18) 135 – 5.(x + 4) = 35
20) (3x – 5)3 – 1 = 26
1)5x+2(x+1/2)=7
2)8x-3(x+2)=9
3)5(x-2)+3(x-1)=19
4)7(x-3)-2x-5=11
5)6x+3-2(x-5)=30
6)8(x-1/8)-5(x-1/5)=10
7)13x-5-2(x+3)=1
8)4(x-2)-2(x-1)=12
9)6x-13-2-(x×5)=7
10)7(x-5)-3(x+5)=30
m) (x + 2).(3 - x) = 0;
d) 511.712 + 511.711
512.712 + 9.511.711
q) (x - 3) + (x - 2) + (x - 1) + … + 10 + 11 = 11
r) (x - 3).(2y + 1) = 7;
s) Tìm x, y thuộc Z sao cho: |x - 8| + |y + 2| = 2; t) (x + 3).(x2 + 1) = 0.
g. G = 0 – 2 + 4 – 6 + … + 2010 – 2012;
h. H = 13–12 + 11 + 10 – 9 + 8 – 7 – 6 + 5 – 4 + 3 + 2 – 1
i. I = 1 – 2 – 3 + 4 + 5 – 6 – 7 + 8 + … + 2001 – 2002 – 2003 + 2004
giúp minh gấp đc ko mình cần trước 10 giờ cám ơn rất nhiều
