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(15x3y2 - 6x2y - 3x2y2): 6x2y
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(15x3y2 - 6x2y - 3x2y2) : 6x2y
\(\dfrac{15x^3y^2}{6x^2y}-\dfrac{6x^2y}{6x^2y}-\dfrac{3x^2y^2}{6x^2y}\)
= \(\dfrac{5}{2}\)xy - \(\dfrac{1}{2}\)y
Chúc bạn học tốt
Ta có: \(\left(15x^3y^2-6x^2y-3x^2y^2\right):6x^2y\)
\(=\dfrac{15x^3y^2}{6x^2y}-\dfrac{6x^2y}{6x^2y}-\dfrac{3x^2y^2}{6x^2y}\)
\(=\dfrac{5xy}{2}-1-\dfrac{y}{2}\)
(15x3y2 – 6x2y – 3x2y2) : 6x2y
= (15x3y2 : 6x2y) + (-6x2y) : 6x2y + (-3x2y2) : 6x2y
= (15 : 6).(x3 : x2).(y2 : y) + (-6 : 6).(x2 : x2).(y : y) + (-3 : 6).(x2 : x2).(y2 : y)
có ai biết giải k tôi cũng có bài tương tự nhưng k biết giải ?
(15x3y2 - 6x2y-3x2y2):6x2y
= \(\dfrac{15xy}{6}-1-\dfrac{y}{2}\)
= \(\dfrac{5}{2}xy-1-\dfrac{y}{2}\)
a) \(=5x^3-x^2+2\)
b) \(=\dfrac{15}{6}xy-1-\dfrac{1}{2}y\)
\(a,=5x^3-x^2+2\\ b,=\dfrac{5}{2}x^2\cdot\dfrac{3}{2}y-1-\dfrac{1}{2}x\cdot\dfrac{1}{2}y=\dfrac{15}{4}x^2y-\dfrac{1}{4}xy-1\)
a) \(\left(6x^2y-\dfrac{1}{2}xy+12y\right)\left(-\dfrac{1}{3}xy\right)=-2x^3y^2+\dfrac{1}{6}x^2y^2-4xy^2\)
b) \(\left(2x+3-y\right)\left(2x-y\right)=4x^2+6x-2xy-2xy-3y+y^2=4x^2+y^2+6x-3y-4xy\)
c) \(3\left(4x+1\right)\left(4x-1\right)-12\left(4x^2+1\right)=3\left(16x^2-1\right)-48x^2-12=48x^2-3-48x^2-12=-15\)
b. (2x + 3 - y)(2x - y)
= 4x2 - 2xy + 6x - 3y - 2xy + y2
= 4x2 - 4xy + 6x - 3y + y2
= \(\left[\left(2x\right)^2-4xy+y^2\right]\) + (6x - 3y)
= (2x - y)2 + 3(2x - y)
= (2x - y + 3)(2x - y)
\(a,=10x^3-5x^2+5x\\ b,=x^3+27\\ c,=\dfrac{5}{2}xy-1-\dfrac{1}{2}y\\ d,=\left(2x^3-10x^2-11x^2+55x+12x-60\right):\left(x-5\right)\\ =\left[2x^2\left(x-5\right)-11x\left(x-5\right)+12\left(x-5\right)\right]:\left(x-5\right)\\ =2x^2-11x+12\)
(15x3y2-6x2y-3x2y2):6x2y
=\(\dfrac{15x^3y^2-6x^2y-3x^2y^2}{6x^2y}\)
=\(\dfrac{15x^3y^2}{6x^2y}\)-\(\dfrac{6x^2y}{6x^2y}\)-\(\dfrac{3x^2y2}{6x^2y}\)
=\(\dfrac{5xy}{2}\)-1-\(\dfrac{y}{2}\)