\(a)15.\left(\dfrac{212121}{434343}+\dfrac{333333}{353535}\right)\)
\(=15.\left(\dfrac{21}{43}+\dfrac{33}{35}\right)\)
\(=15.\dfrac{2154}{1505}\)
\(=\dfrac{6462}{301}\)
1: Tính
a) B = 2016 x 2016 - 2014 x 2018
b) 327 x 412 + 400 / 328 x 412 -12
c) ( 1234 x 567 - 667 ) : ( 567 + 1234 x 5
Tính:
1) 327 x 412 + 400 / 328 x 412 -12
2) ( 1234 . 567 - 667 ) : ( 567 + 1234 . 566)
CÁC BẠN GIẢI CỤ THỂ RA NHÉ !
(x+1/5)2 + 17/25=26/25
x+2/ 327+ x+3/326+x+4/325+x+5/324+x+349/5=0
(15-x)+(x-12)= 7-(-5+x)=
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
bai 1: thuc hien phep tinh a) 62 : 4 . 3 + 2 . 52
b) 5 . 42 - 18 : 32
c) 2448 : [ 119 - ( 23 - 6 )
bai 2 : tim x , biet :
a) 125 - 5 ( x + 4 ) = 38
b) (3x - 24) . 73 - 2 . 74
c) 70 : x , 84 : x va x > 8
d) x : 12, x : 25 , x : 30 va 0 < x < 500
bai 3 : So hoc sinh khoi 6 cua mot truong khoang tu 200 den 400 khi xep hang 12 hang,15 hang 18 hang vua du . Tinh so hoc sinh do
a) -12.(x-5)+7(3-x)=15
b) 30.(x+2)-6.(x-5)-24.x=100
Bài 1: Tìm x , biết:
1) x - 2 = -6 12) 3 . | x - 1 | - 5 = 7
2) -5 . x - ( -3 ) = 13 13) -12 . ( x - 5 ) + 7 . ( 3 - x ) = 5
3) 15 - ( x - 7 ) = -21 14) ( x - 2 ) . ( x + 4 ) = 0
4) 3 .x + 17 = 2 15) ( x - 2 ) . ( x + 15 ) = 0
5) 45 - ( x - 9 ) = -35 16) ( 7 - x ) . ( x + 19 ) = 0
6) ( -5 ) + x = 15 17) -5 < x < 1
7) 2 . x - ( -17 ) = 15 18) | x | < 3
8) | x - 2 | = 3 19) ( x - 3 ) . ( x - 5 ) < 0
9) | x - 3 | - 7 = 13 20) 2 . x2 - 3 = 29
10) 72 - 3 . | x + 1 | = 9 21) -6 . x - ( -7) = 25
11) 17 - ( 43 - | x | ) = 45 22) 46 =- ( x - 11 ) = -48
