rút gọn các phân số sau:a,-24/32;35/-50;-11/-121;25/100 b,3mũ 10.(-5)mux21/(-5)mũ 20.3mũ12 c,2mũ3. 3mũ 4 /2mũ 3. 3mũ 2.5;2mũ4.5mũ2.11mũ 2.7/2mũ3.5mũ3.7 mux2.11 d,-11mũ5.13mũ7/11mũ 5.13mũ8 GIÚP MIK VỚI Ạ MIK ĐANG CẦN GẤP T^T
By Josie
rút gọn các phân số sau:a,-24/32;35/-50;-11/-121;25/100 b,3mũ 10.(-5)mux21/(-5)mũ 20.3mũ12 c,2mũ3. 3mũ 4 /2mũ 3. 3mũ 2.5;2mũ4.5mũ2.11mũ 2.7/2mũ3.5mũ3.7 mux2.11 d,-11mũ5.13mũ7/11mũ 5.13mũ8 GIÚP MIK VỚI Ạ MIK ĐANG CẦN GẤP T^T
Đáp án:
Giải thích các bước giải:
`a) \frac{-24}{32}=\frac{-3}{4}`
`\frac{35}{-50}=\frac{7}{-10}`
`\frac{-11}{-121}=\frac{1}{11}`
`\frac{25}{100}=\frac{1}{4}`
`b) \frac{3^{10}.(-5)^{21}}{(-5)^{20}.3^{12}}`
`=\frac{3^{10}.(-5)^{20}.(-5)}{(-5)^{20}.3^{10}.3^2}`
`=\frac{-5}{3^2}=\frac{-5}{9}`
`c) \frac{2^{3}.3^{4}}{2^{3}.3^{2}.5}`
`=\frac{2^{3}.3^{2}.3^2}{2^{3}.3^{2}.5}`
`=\frac{3^2}{5}=\frac{9}{5}`
`\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}=\frac{22}{35}`
`d) \frac{-11^{5}.13^7}{11^{5}.13^8}`
`=\frac{-11^{5}.13^7}{11^{5}.13^{7}.13}`
`=\frac{-1}{13}`
a)$\dfrac{-24}{32}=\dfrac{-3}{4}$
$\dfrac{35}{-50}=\dfrac{-35}{50}=\dfrac{-7}{10}$
$\dfrac{-11}{-121}=\dfrac{11}{121}=\dfrac{1}{11}$
$\dfrac{25}{100}=\dfrac{1}{4}$
b)$\dfrac{3^{10}.(-5)^{21}}{(-5)^{20}.3^{12}}=\dfrac{3^{10}.(-5)}{3^{10}.3^{2}}=\dfrac{-5}{9}$
c)$\dfrac{2^{3}.3^{4}}{2^{3}.3^{2}.5}=\dfrac{3^{2}}{5}=\dfrac{9}{5}$
$\dfrac{2^{4}.5^{2}.11^{2}.7}{2^{3}.5^{3}.7^{2}.11}=\dfrac{2.11}{5.7}=\dfrac{22}{35}$
d)$\dfrac{(-11)^{5}.13^{7}}{11^{5}.13^{8}}=\dfrac{-1}{13}$
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