a 4^10.8^15=(2^2)10.(2^3)^15=2^20.2^45=2^65

b 4^15.5^30=(2^2)^15.5^30=2^30.5^30=10^30

c 27^16.9^10=(3^3)^16.(3^2)^10=3^48.3^20=3^68 ( nếu đúng thì tick nhé )

4^10*8^15

ta có:4^10=(2^2)^10=2^20

        8^15=(2^3)^15=2^45

2^20*2^45=2^65

Vậy 4^10*8^15=2^65

nhé!

4^10.8^15

Ta có : 4^10=2^20

           8^15=2^45

=> 2^20.2^45=2^20+45

=>2^20+25=2^65

Vậy 4^10.8^15=2^65

Các bạn nhớ nhé!

a) 27 + ( -2019 ) + ( -27 )

= [ 27 + ( - 27) ] + ( - 2019)

= 0 - 2019

= - 2019

b) ( -10 ) + 23 + ( -20 ) + 30

= [ ( - 10 ) + (- 20) + 30]+ 23

= [ ( - 30) + 30] + 23

= 0 + 23 = 23

c) ( -2 ).125.( -5 ).( -8 ).( +17 )

= [ - 2 . ( - 5 )] . [ 125 . ( - 8)] . 17

= 10 . 1000 . 17

= 170000

d) ( -9 ) + ( -15 ) + ( -33 )

= - 24 + ( - 33 )

= - 57

e) ( -15 ).6 = - 80

f) 5.( -9 ) + 4.9 = 9 . ( - 5 + 4) = 9 . 1 = 9

mình cũng hỏi về cái này gấp nha ai biết trả lời câu nào thì trả

a) - 36 . (16 - 41) - 16 . (41 - 36)

= -36.(-25)-16.5

= 900-80

= 820

b) - 15. (-27 + 30) - 27 . (30 - 15) - 30 . (5 - 27)

= -15.3-27.15-30.(-22)

= -45-405.(-660)

= (-450).(-660)

= 297000

Bạn giúp người khác mà muốn trả công à.

Bạn chỉ cần rút gọn các PS về MS bằng 5 rồi tính bình thường.

a) 3/7 + 4/9 + 4/7 + 5/9

= ( 3/7 + 4/7 ) + ( 4/9 + 5/9 )

= 7/7 + 9/9

= 1  + 1 

= 2

b)1/5 + 4/10 + 9/15 + 16/20 + 25/25 + 36/30 + 49/35 + 64/40 + 81/45

= 1/5 + 2/5 + 3/5 + 4/5 + 5/5 + 6/5 + 7/5 + 8/5 + 9/5

= ( 1/5 + 9/5 ) + ( 2/5 + 8/5 ) + (7/5 + 3/5 ) + ( 4/5 + 6/5  ) + 5/5

= 2 + 2 + 2 + 2 + 1

= 2  x 4 + 1

= 8  +1 

= 9

c)  1/8 + 1/12 + 3/8 + 5/12

= ( 1/8 + 3/8 ) + ( 1/12 + 5/12)

= 4/8 + 6/12

= 1/2 + 1/2

= 2/4 = 1/2

mỏi tay rồi

d; (1 - \(\dfrac{1}{2}\)) x (1 - \(\dfrac{1}{3}\)) x (1 - \(\dfrac{1}{4}\)) x ... x ( 1 - \(\dfrac{1}{100}\))

 = \(\dfrac{1}{2}\) x \(\dfrac{2}{3}\)  x \(\dfrac{3}{4}\) x \(\dfrac{3}{4}\) x ... x \(\dfrac{99}{100}\)

= \(\dfrac{1}{100}\)

e; \(\dfrac{9}{5}\) : \(\dfrac{17}{15}\) + \(\dfrac{8}{5}\) : \(\dfrac{17}{15}\)

=  \(\dfrac{9}{5}\) x \(\dfrac{15}{17}\) + \(\dfrac{8}{5}\) x \(\dfrac{15}{17}\)

=  \(\dfrac{27}{17}\) + \(\dfrac{24}{17}\)

=  \(\dfrac{51}{17}\)

=   3

a) 1/2 + 3/4 - (3/4 - 4 - 5)

= 1/2 + 3/4 - 3/4 + 4 + 5

= (3/4 - 3/4) + (4 + 5) + 1/2

= 0 + 9 + 1/2

= 19/2

b) [9/16 + 8/(-27)] - (19/27- 7/16 - 2)

= 9/16 - 8/27 - 19/27 + 7/16 + 2

= (9/16 + 7/16) + (-8/27 - 19/27) + 2

= 1 - 1 + 2

= 2

c) -5/8 . [4/9 + 7/(-12)]

= -5/8 . (-5/36)

= 25/288

d) 7/10 . (-3/5) + 7/10 . (-2/5) - (-3/10)

= 7/10 . (-3/5 - 2/5) + 3/10

= 7/10 . (-1) + 3/10

= -2/5

e) -3/7 . 5/9 + 4/9 . (-3/7) + 2 3/7

= -3/7 . (5/9 + 4/9) + 17/7

= -3/7 . 1 + 17/7

= 2

f) 8 2/7 - (3 4/9 + 4 2/7)

= 8 + 2/7 - 3 - 4/9 - 4 - 2/7

= (8 - 3 - 4) + (2/7 - 2/7) - 4/9

= 1 - 4/9

= 5/9

h) 3.(-1/2)² - (4/5 + 8/15) : 5/6

= 3.1/4 - 4/3 : 5/6

= 3/4 - 8/5

= -17/20

DAI QUA .