6^10.5^15-6^10.5^14
25^7.6^11
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
`#` `\text{dkhanhqlv}`
`4)`
`a)3.(-5/11)`
`=-15/11`
`b)3/5+4/7 . 14/6`
`=3/5 + 4/3`
`=9/15+20/15`
`=29/15`
`c) 10/21-3/8 . 4/15`
`=10/21-1/10`
`=100/210-21/210`
`=79/100`
`d)(2/3+3/4)(5/7+5/14)`
`=(8/12+9/12)(10/14+5/14)`
`=17/12 . 15/14`
`=85/56`
`5)`
`a)x-1/2=3/10 . 5/6`
`=>x-1/2=1/4`
`=>x=1/4+1/2`
`=>x=1/4+2/4`
`=>x=3/4`
`b)x/5 = -3/14`
`=>x : 5 = -3/14`
`=>x=-3/14 . 5`
`=>x=-15/14`
`c)x+2/3=9/15 . 5/27`
`=>x+2/3=1/9`
`=>x=1/9-2/3`
`=>x=1/9-6/9`
`=>x=-5/9`
Câu 1 xem kỉ đề
\(B,\frac{49^6.5-7^{11}}{\left(-7\right)^{10}.5-2.49^5}=\frac{7^{12}.5-7^{11}}{7^{10}.5-2.7^{10}}=\frac{7^{11}.\left(7.5-1\right)}{7^{10}.\left(5-2\right)}=\frac{7.34}{3}=\frac{238}{3}\)
a) A=212.35-\(\frac{2^{12}.3^6}{2^{12}}\)+93+84.35
=212.35-36+36+212.35
=213.35
b)B=496.5-5.\(\frac{7^{11}}{\left(-7\right)^{10}}-2.49^5\)
=496.5-7.5-2.495
=712.5-7.5-2.710
y x 11 - y = 10.5
y x ( 11 - 1 ) = 10.5
y x 10 = 10.5
y = 10.5 : 10
y = 1.05
\(\dfrac{45^{10}.5^{20}}{75^{15}}\)
\(=\dfrac{9^{10}.5^{10}.5^{20}}{25^{15}.3^{15}}\)
\(=\dfrac{3^{20}.5^{30}}{5^{30}.3^{15}}\)
\(=3^5=243\)
Ta có: \(\frac{45^{10}\cdot5^{20}}{75^{15}}\)
\(=\frac{15^{10}\cdot3^{10}\cdot5^{20}}{15^{15}\cdot5^{15}}=\frac{15^{10}\cdot3^{10}}{15^{10}\cdot15^5}\cdot3125=\frac{3^{10}\cdot5^5}{3^5\cdot5^5}=\frac{3^{10}}{3^5}=243\)