tính
\(15^8.2^4\)
\(27^5:32^3\)
2. Đặt tính rồi tính :
a ) 24 : 6 30 : 5 15 : 3 20 : 4
b) 32 : 5 34 : 6 20 : 3 27 : 4
Help me Ngày mai em nộp rồi
a) 24 : 6= 4 30 : 5= 6 15: 3=5 20 : 4= 5
b) 32 :5= 6 ?( dư 4) còn lại em tính đi nhé!!
a) 24 : 6= 4 30 : 5= 6 15: 3=5 20 : 4= 5
b) 32 :5= 6 ?( dư 4)
Tìm x biết : a) x/8=4/-32 b) x-7/18=3và5/12 c) -3/8.2/5+(-3)/8.9/5-(-3)/8.6/5
`x/8=4/(-32)`
`(4x)/32=(-4)/32`
`4x=-4`
`x=-1`
Vậy `x=-1`.
`b)x-7/18=3 5/12`
`x-7/18=41/12`
`x=41/12+7/18`
`x=137/36`
Vậy `x=137/36`
`c)-3/8. 2/5+(-3)/8. 9/5-(-3)/8. 6/5`
`=-3/8. 2/5-3/8. 9/5+3/8. 6/5`
`=3/8(-2/5-9/5+6/5)`
`=3/8.(-1)`
`=-3/8`
Tính hợp lý
a, - ( - 15 ) - ( +27 ) + ( + 27 ) + ( -15 ) + ( -29)
b, 12 - ( a + 105 - 13 ) + ( 4 + 105 - 13 )
c, ( 5 + 7 - 8 ) - ( 7 + 5 - 8 )
d, - 15 - ( -17 + 21 - 35 ) + ( -17 + 21 - 35)
e, 32 - ( -7 - 28 + 15 ) - ( 7 + | -28 | + 32 )
f, -1379 - ( -1379 - 27 )
Làm giùm, cần gấp.
Tính giá trị biểu thức:
a, 15 . { 32 : [ 6 - 5 + 5 ( 9 : 3 ) ] + 3 } - 2018 0
b, 25 . { 2 7 : [ 12 - 4 + 2 2 . 16 : 2 3 ] - 2 4 }
c, 2019 . { 101 - 1000 : [ 2 2 . 2 3 + 5 6 : 5 3 - 6 2 : 11 - 2018 0 ] }
a, 15 . { 32 : [ 6 - 5 + 5 ( 9 : 3 ) ] + 3 } - 2018 0
= 15.{32:[1+15]+3}–1
= 15.5–1
= 74
b, 25 . { 2 7 : [ 12 - 4 + 2 2 . 16 : 2 3 ] - 2 4 }
= 25.{128:[8+4.2]–16}
= 25.24
= 600
c, 2019 . { 101 - 1000 : [ 2 2 . 2 3 + 5 6 : 5 3 - 6 2 : 11 - 2018 0 ] }
= 2019.{101–1000:[(32+125–36):11–1]}
= 2019.{101–1000:[121:11–1]}
= 2019.{101–1000:10}
= 2019.1
= 2019
1) [(52.23-72.2):2].6-7.2
2)15.(27+18+6)+15.(23+12)
3)(81:33.15):9.(40:8.2)
Giúp mik nha!!!
1) [(52.23-72.2):2].6-7.2
=[(25.8-49.2):2].6-49
=[(200-98):2].6-49
=[102:2].6-49
=51.6-49
=306-49
=257
2)15.(27+18+6)+15.(23+12)
=15.51+15.35
=15.(51+35)
=15.86
=1290
3)(81:33.15):9.(40:8.2)
=(81:27.15):9 .(5.2)
=(3.15):9.10
=45:9.10
=5.10
=50
Tính nhanh:
2/3 x 4/5 + 4/5 x 8/3 27/32 x 16/9 - 27/32 x 7/9 + 27/32
2/3 x 4/5 + 4/5 x 8/3 = 4/5 x (2/3 + 8/3) = 4/5 x 10/3 = 8/3
27/32 x 16/9 -27/32 x7/9 + 27/32
= 27/32 x (16/9 - 7/9 + 1 )
=27/32 x 2
=27/16
\(\frac{2}{3}\) x \(\frac{4}{5}\) + \(\frac{4}{5}\) x \(\frac{8}{3}\)
=\(\frac{4}{5}\) x ( \(\frac{2}{3}\) + \(\frac{8}{3}\) )
= \(\frac{4}{5}\) x \(\frac{10}{3}\)
= \(\frac{40}{15}\) = \(\frac{8}{5}\)
bài 1 :
3/7 + 4/5 + 4/7.
6/11 + 2/15 + 5/11.
4/9 + 2/5 + 15/27.
6/13 + 9/32 + 21/26.
`3/7 + 4/5 + 4/7`
`= (3/7 +4/7)+4/5`
`= 7/7 +4/5`
`= 1 + 4/5`
`= 5/5 +4/5`
`=9/5`
`------`
`6/11 + 2/15 + 5/11`
`=(6/11 + 5/11)+2/15`
`= 1 + 2/15`
`= 15/15 +2/15`
`= 17/15`
`-----`
`4/9 + 2/5 + 15/27`
`= (4/9 + 15/27 )+2/5`
`= 1+2/5`
`=5/5 +2/5`
`=7/5`
`-----`
`6/13 + 9/32 + 21/26`
`= (6/13 + 21/26)+9/32`
`= ( 12/26 + 21/26)+9/32`
`= 33/26 +9/32`
`=645/416`
Thực hiện phép tính
81×(27+9^15): 3^5+3^32
Thực hiện phép tính
81. (27+9^15):(3^5+3^32)
81. (27 + 915) : ( 35 + 332)
= 81 . (33 +(32)15) :(35 + 332)
= 34 . (33 + 32.15) :(35 + 332)
= 32 .(32 . (33 + 330) :(35 + 332)
= 9 .(32 . 33 + 32 . 330) : (35 + 332)
= 9 . (35 + 332) : (35 + 332)
= 9 . 1
= 9
tại sao đg 3^4 lại chuyển thành 3^2 bn
1. Tính hợp lí : A. (0.25)^3×32
B. (-0.125)^3.80^4
C. 8^2×4^5/2^20
D. 81^11×3^17/27^10×9^15