Question

Câu 1 : Thu gọn các đơn thức sau

a, \(-3x^2y.\frac{2}{3}xy^3\)

b,\(-2x^2y.\frac{2}{3}x^2y^2\)

Answer 1

a,  -3x^2y.2/3xy^2 = -2x^3y^4

b,-2x^2y.2/3x^2y^2 = =4/3x^4y^3

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Answer 2

\(a,-3x^2y\cdot\frac{2}{3}xy^3\)

\(=\left(-3\cdot\frac{2}{3}\right)\left(x^2yxy^3\right)\)

\(=-2\left(x^2x\right)\left(yy^3\right)\)

\(=-2x^3y^4\)

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Answer 3

\(b,-2x^2y\cdot\frac{2}{3}x^2y^2\)

\(=\left(-2\cdot\frac{2}{3}\right)\left(x^2ỹ^{ }x^2y^2\right)\)

\(=-\frac{4}{3}\left(x^2x^2\right)\left(yy^2\right)\)

\(=-\frac{4}{3}x^4y^3\)

`````Hok Tốt ````

Answer 4

a) \(-3x^2y.\frac{2}{3}xy^3=\left(-3.\frac{2}{3}\right).\left(x^2y.xy^3\right)=-2.\left(x^2x.yy^3\right)=-2x^3y^4\)

b) \(-2x^2y.\frac{2}{3}.x^2y^2=\left(-2.\frac{2}{3}\right).\left(x^2y.x^2y^2\right)=-\frac{4}{3}.\left(x^2x^2.yy^2\right)=-\frac{4}{3}x^4y^3\)

Answer 5

\(-3x^2y.\frac{2}{3}xy^3\)

\(=\left(-3.\frac{2}{3}\right).\left(x^2y.xy^3\right)\)

\(=-2x^3y^4\)

Answer 6

\(-2x^2y.\frac{2}{3}x^2y^2\)

\(=\left(-2.\frac{2}{3}\right).\left(x^2y.x^2y^2\right)\)

\(=-\frac{4}{3}x^4y^3\)

Answer 7

\(a,-2x^3y^4\)

\(b,-\frac{4}{3}x^4y^3\)

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