4x2y-{x2y-「3xy2 – 1/ 2(4x2y-8xy2)+x2y」}-5xy2 在此题中2是x或y的平方(2次方)
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4x2y-{x2y-「3xy2–1/2(4x2y-8xy2)+x2y」}-5xy2在此题中2是x或y的平方(2次方)4x2y-{x2y-「3xy2–1/2(4x2y-8xy2)+x2y」}-5xy2在
4x2y-{x2y-「3xy2 – 1/ 2(4x2y-8xy2)+x2y」}-5xy2 在此题中2是x或y的平方(2次方)
4x2y-{x2y-「3xy2 – 1/ 2(4x2y-8xy2)+x2y」}-5xy2
在此题中2是x或y的平方(2次方)
4x2y-{x2y-「3xy2 – 1/ 2(4x2y-8xy2)+x2y」}-5xy2 在此题中2是x或y的平方(2次方)
答案:2x^2y+2xy^2
原式=4x2y-{x2y-[3xy2-2x2y+4xy2+x2y]}-5xy2
=4x2y-{x2y-[7xy2-x2y]}-5xy2
=4x2y-{x2y-7xy+x2y]}-5xy2
=4x2y-{2xy2-7xy}-5xy2
=4x2y-2xy2+xy-5xy2
=2x^2y+2xy^2
3x2y+xy2-[2xy2-4x2y+(x2y-2xy2)]
4x2y-{x2y-「3xy2 – 1/ 2(4x2y-8xy2)+x2y」}-5xy2 在此题中2是x或y的平方(2次方)
5xy2-【3xy2-(4xy2-2x2y)】+2x2y】+2x2y-xy2 化简,再求值
(x2y)3 × (-xy2)3
化简:5(3x2y-xy2) * (xy2+3x2y)
-3x2y+2x2y+3xy2-2xy2
-3x2+2x2y+xy2
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