158.42-58.6.7-112
Cho khổ thơ:
Gà gáy canh tư
Mẹ em xay lúa
Lúa vào như sao
Sao nhòm ngoài cửa.
khổ thơ này ở trong bài nào?
\(\frac{112}{13.20}+\frac{112}{20.27}+\frac{112}{27.34}+...+\frac{112}{62.69}\)
\(\frac{112}{13.20}+\frac{112}{20.27}+\frac{112}{27.34}+...+\frac{112}{62.69}\)
= \(16.\left(\frac{7}{13.20}+\frac{7}{20.27}+\frac{7}{27.34}+...+\frac{7}{62.69}\right)\)
= \(16.\left(\frac{1}{13}-\frac{1}{20}+\frac{1}{20}-\frac{1}{27}+\frac{1}{27}-\frac{1}{34}+...+\frac{1}{62}-\frac{1}{69}\right)\)
= \(16.\left(\frac{1}{13}-\frac{1}{69}\right)\)
= \(16.\frac{56}{897}\)
= \(\frac{896}{897}\)
\(\frac{112}{13.20}+\frac{112}{20.27}+\frac{112}{27.34}+...+\frac{112}{62.69}\)
\(=16\left(\frac{7}{13.20}+\frac{7}{20.27}+\frac{7}{27.34}+...+\frac{7}{62.69}\right)\)
\(=16\left(\frac{1}{13}-\frac{1}{20}+\frac{1}{20}-\frac{1}{27}+...+\frac{1}{62}-\frac{1}{69}\right)\)
\(=16\left(\frac{1}{13}-\frac{1}{69}\right)=\frac{16}{13}-\frac{16}{69}\)
Ta có:
\(\frac{112}{13.20}+\frac{112}{20.27}+\frac{112}{27.34}+....+\frac{112}{62.69}\)
= \(16.\left(\frac{7}{13.20}+\frac{7}{20.27}+\frac{7}{27.34}+...+\frac{7}{62.69}\right)\)
= \(16.\left(\frac{1}{13}-\frac{1}{20}+\frac{1}{20}-\frac{1}{27}+\frac{1}{27}-\frac{1}{34}+...+\frac{1}{62}-\frac{1}{69}\right)\)
= \(16.\left(\frac{1}{13}-\frac{1}{69}\right)\)
= \(16.\frac{56}{897}=\frac{896}{897}\)
So Sánh
a= 112/111+113/112+114/113
b= 111/112+112/111
Ta có:
a=3.026787138
b=2.0000(804375
->a>b
tính :
C=(112/13.20+112/20.27+112/27.34+...+112/62.69):(-5/9.13-7/9.25-13/19.25-31/19.69)
112/13.20+112/20.27+...+112/62.69
=112/7.(7/13.20+7/20.27+...+7/62.69)
=16.(1/12-1/20+1/20-1/27+...+1/62-1/69)
=16.(1/13-1/69)=896/897
tính ( ghi rõ các bước )
112 x 56 + 112 x 46 - 112 x 2
112 x 56 + 112 x 46 - 112 x 2
122 x ( 56 + 46 - 2 )
122 x 100
12200
1.Cho f(x)=3x^3/(3x^2-3x+1)
A=f(1/112)+f(2/112)+..+f(110/112)+f(111/112)-1/2
(112/13x20)+(112/20x27)+...+(112/62x69):(-5/9.13-7/9x25-13/19x25-31/19x69)
(112/13x20)+(112/20x27)+...+(112/62x69):(-5/9.13-7/9x25-13/19x25-31/19x69)
a.(112/13.20 + 112/ 20.27 + 112/ 27.34 + ... +112/62.69 ) : ( -5/9.13 -7/ 9.25 - 13/19.25 - 31/19.69)
Tính bằng cách hợp lí. Ai giải nhanh mình tick cho