Toán Lớp 8: 1) Rút gọn
A) (-5a^5b³+3a^6b²)÷4a⁴b²
B) (1/3a³b+1/3a²b²-1/4ab^5)÷5ab
2) Rút gọn
(3x⁴+1/3x²)÷x-x³÷3x²+(3x)³
Mn giúp e với ạ, e cần gấp lắm á
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Toán Lớp 8: 1) Rút gọn
A) (-5a^5b³+3a^6b²)÷4a⁴b²
B) (1/3a³b+1/3a²b²-1/4ab^5)÷5ab
2) Rút gọn
(3x⁴+1/3x²)÷x-x³÷3x²+(3x)³
Mn giúp e với ạ, e cần gấp lắm á
Comments ( 1 )
1)a)\\
\left( { – 5{a^5}{b^3} + 3{a^6}{b^2}} \right):4{a^4}{b^2}\\
= – \dfrac{5}{4}ab + \dfrac{3}{4}{a^2}\\
b)\left( {\dfrac{1}{3}{a^3}b + \dfrac{1}{3}{a^2}{b^2} – \dfrac{1}{4}a{b^5}} \right):5ab\\
= \dfrac{1}{{15}}{a^2} + \dfrac{1}{{15}}ab – \dfrac{1}{{20}}{b^4}\\
2)\\
\left( {3{x^4} + \dfrac{1}{3}{x^2}} \right):x – {x^3}:3{x^2} + {\left( {3x} \right)^3}\\
= 3{x^3} + \dfrac{1}{3}x – \dfrac{1}{3}x + 27{x^3}\\
= 30{x^3}
\end{array}$