a)\(29.\left(-13\right)-27.\left(-29\right)-14.\left(-29\right)\)
\(=13\left(-29\right)-27.\left(-29\right)-14.\left(-29\right)\)
\(=-29.\left(13-27-14\right)\)
\(=\left(-28\right).\left(-29\right)\)
\(=812\)
giúp mik với mik đang cần gấp
b1 Tính hợp lý
a) 29x(-13)-27x(-29)-(-14)x(-29)
b) (-67)x(1-301)-301x67
c) (-4)x(-125)x25x(-8)x7
d) 1-2+3-4+5-6+....+2013
b2 Tìm x
a) 11-(15+11)=x-(25-9)
b) 4x2^x-3=125
(125 -679 + 145 ) - ( 125 - 679 )
(x - 29 ) - ( 17 - 38 ) = -9
( x + 5 ) + ( x - 9 ) = x + 2
( 27 - x )+ ( 15 + x ) = x - 24
-359 + 181 + ( -123 ) + 350 + ( -172 )
13 - 12 + 11 + 10 - 9 + 8 - 7 -6 + 5 - 4 + 3 + 2 -1
1. (-12)+(-15)+(-31) | 2. 25+37-59 | 3. (-12)+13-(-60)
4. 24:(-2)+(-5) | 5. 32.(-2)+64 | 6. 18.3+(-50):5
7. (-24)+37+163+(-176) | 8. 125+217+(-625)+529 | 9. 29+132+237+868+763
10. (-87)+126+187+74 | 11. 29.87+29.13 | 12. 123.(-29)-23.(-29)
13. 31.(-18)+31.(-81)-31 | 14.(-12).47+(-12).52+(-12) | 15. 24.(16-5)-16.(24-5)
16. 29.(29-3)-19.(29-13) | 17. -452-(-67+75-452) | 18. -(-171+89+223)-(71-111)+223
19. 21.83-3.7.(-17) | 20. 35-{12-[-14+(-2)]} | 21.5+10+15+20+....+1000
22. 3-6+9-12+....+195-198
tính nhanh
a)(-4)x(+3)x(-125)x(+25)x(-8)
b)(-67)x(1-301)-301x67
Dùng tính chất để tính
a) 17/5 . -31/125 . 1/2 . 10/17 . -1/23
b) (11/4 . -5/9 - 4/9 . 11/4) . 8/33
c) (17/28 + 18/29 - 19/30 - 20/31) . (-5/12 + 1/4 + 1/6)
d) -1/4 . 15^2/11 + 68/4 . -1/11
e) -9/25 . 53/3 - (-3/5)^2 .22/3
bài 1:tìm x biết
a) x + 1/9 - 3/5= 3/6 b) 3/4 - x + 6/-11 = 5/6
bài 2: tìm x biết
a) x : 13/16= 5/-8 b) x . -14/28 = 6/-9 - 2/15
c) -12/25 . (3/4 -x + 6/-11 - 5/6) = 0 d) x: 4/28 = 13/-19 + 8/25
bài 3:tìm x biết
a) 62/7.x= 29/9:3/56 b) 1/5:x=1/5+1/7 c)1/2a2+1 : x=2
bài 1:tìm x biết
a) x + 1/9 - 3/5= 3/6 b) 3/4 - x + 6/-11 = 5/6
bài 2: tìm x biết
a) x : 13/16= 5/-8 b) x . -14/28 = 6/-9 - 2/15
c) -12/25 . (3/4 -x + 6/-11 - 5/6) = 0 d) x: 4/28 = 13/-19 + 8/25
bài 3:tìm x biết
a) 62/7.x= 29/9:3/56 b) 1/5:x=1/5+1/7 c)1/2a2+1 : x=2
a) 25 . 8 - 12 . 5 + 272 : 17 - 8
b) 125 : 25 + 14 - 142 : 71
c) 13 . 17 - 256 : 16 + 14 :7 -1
d) 15 . 24 - 14 . 5 ( 145 : 5 - 27 )
2, Tìm X, biết:
a) 37 + x = 55
b) x - 31 = 24
c) 21 ( x - 11 ) = 21
d) 9 . ( x - 29 ) = 0
e) ( x - 1954 ) . 5 = 50
f) 30 . 60 - x = 30
Bài 1 : Tìm y:
a) y - ( -42 - 2y ) = ( -12 ) - 14 + 2y
b) 15 - ( - y + 5 ) - 5y = - ( 12+ 5y)
c) 2y - ( -5 + 8y - 21 ) = -3 - ( 5y + 2 )
e) - 13 - ( - 3y - 23 ) = - ( 120 - y )
g) - 21 - ( -32 - 5y ) = - ( - 16 - 4y )
Bài 2 :
a) ( - 5 ) x 6 + 15 x 6
b) 9 x ( - 3 ) + 9 x 23
c) ( -10) x 11 + 210 x 11
d) 125 x 4 - 125 x (-4)
