687+(2×5)+10

=687+10+10

=697+10

=707

`687 + (2 × 5) + 10`

`= 687 + 10 + 10`

`= 697 + 10`

`= 707`

687+(2x5)+10= 687+10+10=707

a) 90 – ( 30 – 20) = 90 – 10

                   = 80

90 – 30 – 20 = 60 - 20

                  = 40

b) 100 – (60 + 10) = 100 – 70

                   = 30

100 - 60 + 10 = 40 + 10

                   = 50

c) 135 – (30 + 5) = 135 – 35

                   = 100

135 – 30 – 5 = 105 – 5

                   = 100

d) 70 + (40 – 10) = 70 + 30

                   = 100

70 + 40 – 10 = 110 -10

                   = 100

nguuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

nguuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

Bạn tự hỏi rồi từ trả lời ! Bạn xem đầu bạn có nóng không ?

olm ko cho tự hỏi tự trả lời đâu nhoa.

`Answer:`

\(A=\left(1^{100}+2^{100}+...+10^{100}\right)\left(5^{10}-25^5\right)\)

\(=\left(1^{100}+2^{100}+...+10^{100}\right)[5^{10}-\left(5^2\right)^5]\)

\(=\left(1^{100}+2^{100}+...+10^{100}\right)\left(5^{10}-5^{10}\right)\)

\(=\left(1^{100}+2^{100}+...+10^{100}\right).0\)

\(=0\)

\(B=\left(2^5+3^5+4^5\right)\left(1^2+2^2+...+100^2\right)\left(4^{10}-2^{20}\right)\)

\(=\left(2^5+3^5+4^5\right)\left(1^2+2^2+...+100^2\right)\left(2^{2.10}-2^{20}\right)\)

\(=\left(2^5+3^5+4^5\right)\left(1^2+2^2+...+100^2\right).0\)

\(=0\)

1)50+50+50+100/5

=50+50+50+20

=100+70

=170

2)100/100+20/10+5

=1+2+5

=3+5

=8

3)200/100+50/10+6

=2+5+6

=7+6

=13

minh tr nha ban

C1 : lần trước mình giải 

C2 : mình không chắc thử xem 

thay x= 9 vao F ta có

F = 9^14 - 10 .9^13 + 10.9^12 - 10 .9^11 + ... +10.9^2 -10.9 + 10

  = 9^14 - ( 9 + 1 ) . 9^13 + (9+1). 9^12+..+(9+1) .9^2 - (9+1)9 +10

 = 9^14 - 9^14 - 9^13 + 9^13 + 9^12 -.....+9^3 + 9^2 - 9^2 -   9 + 10 = 1

Tương tự vói G , H 

kho

mình đang thắc mắc bài này luôn

\(a,\dfrac{20^5.5^{10}}{100^5}=\dfrac{20^5.5^5.5^5}{100^5}=\dfrac{100^5.5^5}{100^5}=5^5\)

\(\frac{20^5.5^{10}}{100^5}\)

\(=\frac{20^5.\left(5^2\right)^5}{100^5}\)

\(=\frac{20^5.25^5}{100^5}\)

\(=\frac{\left(20.25\right)^5}{100^5}\)

\(=\frac{500^5}{100^5}\)

\(=\left(\frac{500}{100}\right)^5\)

\(=5^5\)

_Chúc bạn học tốt_

\(\frac{20^5.5^{10}}{100^5}\)

\(=\frac{\left(2^2.5\right)^5.5^{10}}{2^2.5^2}\)

\(=\frac{2^{10}.5^5.5^{10}}{2^2.5^2}\)

\(=\frac{2^2.2^8.5^{15}}{2^2.5^2}\)

\(=\frac{2^8.5^2.5^{13}}{5^2}\)

\(=2^8.5^{13}\)

\(\frac{20^5\cdot5^{10}}{100^5}=\frac{20^5\cdot\left(5^2\right)^5}{100^5}=\frac{20^5\cdot25^5}{100^5}=\frac{500^5}{100^5}=5^5=3125\)

giúp mình với

\(\frac{20^5.5^{10}}{100^5}\)

\(\frac{2^{10}.5^5.5^{10}}{2^{10}.5^{10}}=5^5=3125\)

\(\frac{20^5.5^{10}}{100^5}\)\(=\frac{20^5.5^5.5^5}{100^5}\)

\(=\frac{100^5.5^5}{100^5}\)\(=5^5\)

\(=3125\)

Chúc bạn học tốt!