Đáp án + giải thích các bước giải :
`4+2xy- x^2-y^2` $\\$ `= 4 - (x^2 - 2xy +y^2)` $\\$ `= 4 - (x-y)^2` $\\$` = (4-x+y)(4+x-y)` $\\$ `x^2-6x+5 ` $\\$ `= x^2 - 5x - x + 5` $\\$ `= x(x-5) - (x-5)` $\\$ `=(x-1)(x-5)`
`+)`
`4+2xy- x^2-y^2`
`=-(-4-2xy+x^2+y^2)`
`=-(x^2-2xy+y^2-4)`
`=-[(x-y)^2-2^2]`
`=-(x-y-2)(x-y+2)`
`x^2-6x+5`
`=x^2-x-5x+5`
`=x(x-1)-5(x-1)`
`=(x-5)(x-1)`
Phân tích nhân tử 1) 5x^3-15x^2+10xy 2) xy-2x(x+3)+3y 3) 2x^2-x+6xy-3y 4) 2x^3+3x^2-1 Mọi người giúp em với ạ:<
giúp mik vs :< mik đang cần gấp
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yêu cầu tốc độ cực kì cao, ko cần quá chi tiết, ko cần làm bài 1 phần a và b
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