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\(\dfrac{121.75.130.169}{39.60.11.198}=\dfrac{11^2.3.5^2.2.5.13.13^2}{3.13.2^2.3.5.11.2.3^2.11}=\dfrac{2.3.5^3.11^2.13^3}{2^3.3^4.5.11^2.13}=\dfrac{5^2.13^2}{2^2.3^3}=\dfrac{4225}{108}\)
=\(\dfrac{121.75.130.169}{39.60.11.198}\)
=\(\dfrac{25.65.13.13}{13.30.18}\)
=\(\dfrac{5.5.65.13.13}{13.6.5.18}\)
=\(\dfrac{5.65.13}{6.18}\)
=\(\dfrac{65.65}{108}\)
=\(\dfrac{4225}{108}\)
Chúc bạn học tốt !
Trả lời:
\(\frac{121.75.130.169}{39.60.11.198}=\frac{11.11.15.5.65.2.13.13}{13.3.15.4.11.99.2}=\frac{11.5.65.13}{3.4.99}=\frac{4225}{108}\)
hok tốt!!
^^
= 11×11×15×5×39×3×2×65
39×15×2×2×11×3×6×11
= 5×65
2×6
= 325
12
Học tốt~♡
Câu 1: \(\frac{121.75.130.169}{39.60.11.198}\)=\(\frac{11x11x15x5x130x13x13}{13x13x15x4x11x11x18}\)= \(\frac{5x130}{4x18}\)= \(\frac{650}{72}\)= \(\frac{325}{36}\)
Câu 2: \(\frac{1998.1990+3978}{1992.1991-3984}\)= \(\frac{3976020}{3962088}\)= \(\frac{994005}{990522}\)
\(\frac{121\cdot75\cdot130\cdot169}{39\cdot60\cdot11\cdot198}=\frac{11^2\cdot3\cdot5^2\cdot13\cdot2\cdot5\cdot13^2}{13\cdot3\cdot2^2\cdot3\cdot5\cdot11\cdot2\cdot11\cdot3^2}\)
\(=\frac{11^2\cdot3\cdot5^3\cdot13^3\cdot2}{13\cdot3^4\cdot2^3\cdot5\cdot11^2}=\frac{13\cdot5^2}{3^3\cdot2^2}=\frac{325}{36}\)
P/S:Không bt có đúng ko nx nhưng hướng làm là như vậy
1.3:
a: \(\dfrac{5}{14}=\dfrac{5\cdot3}{14\cdot3}=\dfrac{15}{42}\)
\(\dfrac{4}{21}=\dfrac{4\cdot2}{21\cdot2}=\dfrac{8}{42}\)
b: \(\dfrac{4}{5}=\dfrac{4\cdot12}{5\cdot12}=\dfrac{48}{60}\)
\(\dfrac{7}{12}=\dfrac{7\cdot5}{12\cdot5}=\dfrac{35}{60}\)
\(\dfrac{8}{5}=\dfrac{8\cdot12}{5\cdot12}=\dfrac{96}{60}\)
1.2:
a: \(21=3\cdot7;36=3^2\cdot2^2\)
=>\(ƯCLN\left(21;36\right)=3>1\)
=>Phân số này chưa tối giản
\(\dfrac{21}{36}=\dfrac{21:3}{36:3}=\dfrac{7}{12}\)
b: \(23=23;73=73\)
=>\(ƯCLN\left(23;73\right)=1\)
=>23/73 là phân số tối giản
1.1:
theo đề ta có: 480⋮a và 720⋮a
=> a = ƯCLN(480,720)
480=2 mũ 5.3.5
720=2 mũ 4.3 mũ 2.5
=> ƯCLN(420,720)= 2 mũ 4.3.5=240
=> a=240
Tự chép đề bài nhé
=\(\frac{11.11.25.3.65.2.169}{3.13.2.30.11.18.11}\)
=\(\frac{25.65.13.13}{13.30.18}\)
=\(\frac{5.5.65.13.13}{13.6.5.18}\)
=\(\frac{5.65.13}{6.18}\)
=\(\frac{65.65}{108}\)
tự tính tiếp
\(\frac{121.75.130.169}{39.60.11.198} \)= \(\frac{11^2.5^2.3.13.5.2.13^2}{3.13.2^2.3.5.11.2.3^2}\)
= \(\frac{11.5^2.13^2}{2^2.3^3}\)
a) \(\frac{2^3.3^4}{2^2.3^2.5}=\frac{2.3^2}{5}\)
b) \(\frac{2^4.5^2.11^2.7}{2^3.5^3.7^2.11}=\frac{2.11}{5.7}\)
c) \(\frac{121.75.130.69}{39.60.11.198}=\frac{11^2.3.5^2.2.5.13.23.3}{13.3.2^3.3.5.11.11.3^2.2}\)
\(=\frac{11^2.3^2.5^3.2.13.23}{13.3^4.2^4.5.11^2}=\frac{5^2.23}{3^2.2^3}\)
a,\(\frac{2^3.3^4}{2^2.3^2.5}=\frac{2^2.2.3^2.3^2}{2^2.3^2.5}\)\(=\frac{2.3^2}{5}\)
b,\(\frac{2^4.5^2.11^2.7}{2^3.5^3.7^2.11}=\frac{2^3.2.5^2.11.11.7}{2^3.5^2.5.7.7.11}=\frac{2.11}{5.7}\)