Toán A) 5². 3⁵ . (3/5)² B) (1/7) ² . 1/7 . 49² Giúp mình vs mấy bạn ơi 21/07/2021 By Lydia A) 5². 3⁵ . (3/5)² B) (1/7) ² . 1/7 . 49² Giúp mình vs mấy bạn ơi
Đáp án: A) 5².3⁵.(3/5)² =25.243.9/25 =9.243 =2817 B) (1/7)².1/7.49² =1/49.1/7.(50-1)² =1/343(50²-2.50+1) =1/343(2500-100+1) =1/343(2401) =7 Vote và ctlhn ạ Trả lời
a. ${5². 3⁵ . (\dfrac{3}{5})²}$ = ${5^2. 3^5 .\dfrac{3^2}{5^2}}$ = ${3^3}$ b. ${(\dfrac{1}{7})^2.\dfrac{1}{7}.49 }$ = ${\dfrac{1^2}{7^2}.\dfrac{1}{7}.7^2 }$ = $\dfrac{1}{7}$ Trả lời
Đáp án:
A) 5².3⁵.(3/5)²
=25.243.9/25
=9.243
=2817
B) (1/7)².1/7.49²
=1/49.1/7.(50-1)²
=1/343(50²-2.50+1)
=1/343(2500-100+1)
=1/343(2401)
=7
Vote và ctlhn ạ
a. ${5². 3⁵ . (\dfrac{3}{5})²}$
= ${5^2. 3^5 .\dfrac{3^2}{5^2}}$
= ${3^3}$
b. ${(\dfrac{1}{7})^2.\dfrac{1}{7}.49 }$
= ${\dfrac{1^2}{7^2}.\dfrac{1}{7}.7^2 }$
= $\dfrac{1}{7}$