4:
a: \(=5x^2y^2\cdot\dfrac{7}{10}x^4y\cdot40x^2z^3\)
\(=\left(5\cdot\dfrac{7}{10}\cdot40\right)\left(x^2y^2\cdot x^4y\cdot x^2z^3\right)\)
\(=140x^8y^3z^3\)
Bậc là 8+3+3=14
b: \(=-\dfrac{1}{2}\cdot ab\cdot\dfrac{-4}{3}\cdot a^2bc\cdot5c^2b^3\)
\(=\left(\dfrac{1}{2}\cdot\dfrac{4}{3}\cdot5\right)\cdot ab\cdot a^2b\cdot c\cdot c^2b^3\)
\(=\dfrac{10}{3}a^3b^5c^3\)
Bậc là 11
c: \(=-1.2\cdot ab\cdot100a^4b^2\cdot c^3\cdot\left(-1.5\right)\cdot a^2c\)
\(=1.8\cdot100\cdot ab\cdot a^4b^2c^3\cdot a^2c\)
\(=180a^7b^3c^4\)
Bậc là 14
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