mik lm đc nhưng lm biếng tính quá

\(\frac{864.48-432.96}{864.48.432}=\frac{864.48-432.2.48}{864.48.432}=\frac{864.48-864.48}{864.48.432}\)

\(=\frac{0}{864.48.432}=0\)

ta có tử số= 864.48-432.96=432.2.48-432.96=432.96-432.96=0

vậy phân thức đã cho có giá trị bằng 0

kết quả ra 0 nha bạn 

a) \(\frac{158\cdot168-168\cdot58}{110}\)

\(=\frac{\left(158-58\right)\cdot168}{110}\)

\(=\frac{100\cdot168}{110}=\frac{16800}{110}=\frac{1680}{11}\)

b) \(\frac{\left(456.11+912\right)\cdot37}{13\cdot74}\)

\(=\frac{456\cdot11+456\cdot2\cdot37}{13\cdot37\cdot2}\)

\(=\frac{456\cdot\left(11+2\right)\cdot37}{\left(13\cdot2\right)\cdot37}\)

\(=\frac{456\cdot13\cdot37}{26\cdot37}=228\)

c) \(\frac{864\cdot48-432\cdot96}{864\cdot48\cdot432}\)

\(=\frac{432\cdot2\cdot48-432\cdot48\cdot2}{432\cdot2\cdot48\cdot432}=0\)

\(\frac{158\times168-168\times58}{110}=\frac{168\times\left(158-58\right)}{110}=\frac{168\times100}{110}=\frac{1680}{11}\)

\(\frac{\left(456\times11+912\right)\times37}{13\times74}=\frac{456\times\left(11+2\right)}{13\times2}=\frac{228\times13}{13}=228\)

\(\frac{864\times48-432\times96}{864\times48\times432}=\frac{864\times\left(48-48\right)}{864\times48\times432}=\frac{864\times0}{864\times48\times432}=0\)

a) \(\frac{158.168-168.58}{110}\)

\(=\frac{168\left(158-58\right)}{110}\)

\(=\frac{16800}{100}\)

\(=168\)

b) \(\frac{\left(456.11+912\right).37}{13.74}\)

\(=\frac{\left(5016+912\right).37}{13.74}\)

\(=\frac{5928.37}{962}\)

\(=\frac{219336}{962}\)

\(=228\)

c) \(\frac{864.48-432.96}{864.48.432}\)

mình đang tìm cách

\(\frac{1414+1515+1616+1717+1818+1919}{2020+2121+2222+2323+2424+2525}=\frac{9999}{13635}=\frac{11}{15}\)

\(\frac{1414+1515+1616+1717+1818+1919}{2020+2121+2222+2323+2424+2525}\)

\(=\frac{101\times\left(14+15+16+17+18+19\right)}{101\times\left(20+21+22+23+24+25\right)}\)

\(=\frac{14+15+16+17+18+19}{20+21+22+23+24+25}\)

+) Tử số :

Số các số hạng là : ( 19 - 14 ) : 1 + 1 = 6 ( số )

Tổng là : ( 19 + 14 ) x 6 : 2 = 99

+) Mẫu số :

Số các số hạng là : ( 25 - 20 ) : 1 + 1 = 6 ( số )

Tổng là : ( 25 + 20 ) x 6 : 2 = 135

\(\Leftrightarrow\frac{99}{135}=\frac{11}{15}\)

Ai làm đúng và nhanh nhất mk k cho

cái thứ hai lớn hơn

Ta có : \(\frac{1212+1313+1414+1515+1616}{1717+1818+1919+2020+2121}=\frac{12+13+14+15+16}{17+18+19+20+21}=\frac{28\cdot\frac{5}{2}}{38\cdot\frac{5}{2}}=\frac{14}{19}\)

Dễ thấy \(\frac{111111}{666665}< \frac{1}{2}\) ( do 111111 < 666665/2 ) và \(\frac{14}{19}>\frac{1}{2}\) ( do 14 > 19/2 )

Vậy \(\frac{111111}{666665}< \frac{1212+1313+1414+1515+1616}{1717+1818+1919+2020+2121}\)

=82/135

\(\frac{1414+1515+1616+1717+1818+1919}{2020+2121+2222+2323+2424+2525}\)

\(=\frac{101\left(14+15+16+17+18+19\right)}{101\left(20+21+22+23+24+25\right)}\)

\(=\frac{\left(19+14\right)\left(19-14+1\right):2}{\left(25+20\right)\left(25-20+1\right):2}\)

=\(\frac{33.6:2}{45.6:2}=\frac{33}{45}=\frac{11}{15}\)

\(\frac{1414+1515+1616+1717+1818+1919}{2020+2121+2222+2323+2424+2525}\)

= \(\frac{\left(1414+1919\right)+\left(1515+1818\right)+\left(1616+1717\right)}{\left(2020+2525\right)+\left(2121+2424\right)+\left(2222+2323\right)}\)

= \(\frac{3333+3333+3333}{4545+4545+4545}=\frac{3333}{4545}=\frac{11}{15}\)

t i c k nhé!! 45435436457

11/15

11/15