A = (5^56 + 5^7) : (5^49 + 1)

A = 5^7.(5^49 + 1) : (5^49 + 1)

A = 5^7.[(5^49 + 1) : (5^49 + 1)]

A = 5^7.1

A = 5^7

(7^22 + 7^21 + 7^20) : (2^5 + 2^4 + 3^2)

= 7^20.(7^2 + 7 + 1) : (2^5 + 2^4 + 3^2)

= 7^20.(49 + 1 + 7) : (32 + 16 + 9)

= 7^20.(50 + 7) : (48 + 9)

= 7^20.57: 57

= 7^20.(57:57)

= 7^20.1

=7^20

\(\frac{3}{5}+\frac{6}{11}+\frac{7}{13}+\frac{2}{5}+\frac{16}{11}+\frac{19}{13}\)

\(=\left(\frac{3}{5}+\frac{2}{5}\right)+\left(\frac{6}{11}\frac{16}{11}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)\)

\(=1+2+2\)

\(=5\)

a

        [3/5+2/5]+[7/13+19/13]+[6/11+16/11]=5

A=(-1).(-1)².(-1)³.(-1)⁴...(-1)²⁰¹⁴

=> A=(-1).(-1).(-1).(-1)...(-1)

Vì số cuối mũ với số chẵn nên

=> A = 1

A = -1 nha bạn

voi x =1 

=>M= (1-5)² +2017

M= (-4)² +2017

M= 16 + 2017

M=2033

Vậy M = 2033

b) gia tri nho nhat cua bieu thuc là 2017 

ta có

đặt 3/5+3/7-3/11=N=> N=3*(1/5+1/7-1/11)
đặt 4/5+4/7-4/11=P=> P=4*(1/5+1/7-1/11)

=> N/P=3*(1/5+1/7-1/11)/4*(1/5+1/7-1/11)=> M=3/4

cảm ơn bạn ngọc hằng nha bạn học giỏi thật

2^2/3.3^2/8...........50^2/2499

=2.2.3..4.4.5.5........50.50/3.1.2.4......47.50

=2.51/50=101/50

A = x⁴ + 2x²y² + y⁴ - 7

   = (x² + y²) - 7

Thay x² + y² = 2, ta được

2 - 7 = -5

\(=\frac{5}{6}x\left(\frac{7}{12}+\frac{5}{12}\right)+\frac{1}{6}=\frac{5}{6}x1+\frac{1}{6}=1\)

a) \(\frac{5}{6}x\frac{7}{12}+\frac{5}{12}x\frac{5}{6}+\frac{1}{6}=\frac{5}{6}x\left(\frac{7}{12}+\frac{5}{12}\right)+\frac{1}{6}=\frac{5}{6}x1+\frac{1}{6}=\frac{5}{6}+\frac{1}{6}=1\)

b) \(\left(\frac{8}{15}x\frac{3}{4}x\frac{5}{4}\right):\frac{7}{8}=\frac{4x2x3x5}{5x3x4x4}x\frac{8}{7}=\frac{2}{4}x\frac{8}{7}=\frac{2x8}{4x7}=\frac{2x4x2}{4x7}=\frac{4}{7}\)

Chúc bạn học tốt.

😁😁😁