ax+ay+bx+by
ax+ay+2x+2y
ax+ay-bx-by
ax+ay-2x-2y
nhanh lên mình cần lắm
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bn post nhiều nên mình ghi đáp án thôi nhé phần nào sai đề mình cho qua
b)\(\left(x+1\right)\left(xy+1\right)\)
c)\(\left(a+b\right)\left(x+y\right)\)
d)\(\left(x-a\right)\left(x-b\right)\)
e)\(\left(x+y\right)\left(xy-1\right)\)
f)\(\left(a-b\right)\left(x^2+y\right)\)
Ta có: \(\left(ax+by\right)^2=\left(a^2+b^2\right)\left(x^2+y^2\right)\)
\(\Leftrightarrow a^2x^2+2abxy+b^2y^2=a^2x^2+a^2y^2+x^2b^2+b^2y^2\)
\(\Leftrightarrow2abxy=a^2y^2+x^2b^2\)
\(\Leftrightarrow\left(ay-xb\right)^2=0\)
\(\Leftrightarrow ay=xb\)
hay \(\dfrac{a}{x}=\dfrac{b}{y}\)
`ab(x-3) -a^2(x-3)`
`=(x-3)(a^2-ab)`
__
`ax+ay+bx+by`
`=a(x+y)+b(x+y)`
`=(x+y)(a+b)`
__
`ax+ay -2x-2y`
`=(ax+ay)-(2x+2y)`
`=a(x+y)-2(x+y)`
`=(x+y)(a-2_`
__
`2x-2y +ax-ay`
`=2(x-y)+a(x-y)`
`=(x-y)(2+a)`
__
`10ax -5ay -2x+y`
`= 5a(2x-y) -(2x-y)`
`=(2x-y)(5a-1)`
1: =(x-3)(ab-a^2)
=a(b-a)(x-3)
2: =a(x+y)+b(x+y)
=(x+y)(a+b)
3: =a(x+y)-2(x+y)
=(x+y)(a-2)
4: =2(x-y)+a(x-y)
=(x-y)(a+2)
5: =5a(2x-y)-(2x-y)
=(2x-y)(5a-1)
\(a,=5\left(x-y\right)+a\left(x-y\right)=\left(5+a\right)\left(x-y\right)\\ b,=a\left(x+y\right)+b\left(x+y\right)=\left(a+b\right)\left(x+y\right)\\ c,=x\left(x+1\right)+a\left(x+1\right)=\left(x+a\right)\left(x+1\right)\\ d,Sửa:x^2y+xy^2-3x-3y=xy\left(x+y\right)-3\left(x+y\right)=\left(xy-3\right)\left(x+y\right)\\ e,=xy\left(x+1\right)-\left(x+1\right)=\left(xy-1\right)\left(x+1\right)\\ f,=x^2-4=\left(x-2\right)\left(x+2\right)\\ g,=\left(x+3\right)^2-y^2=\left(x-y+3\right)\left(x+y+3\right)\\ h,=\left(x+5\right)^2-y^2=\left(x-y+5\right)\left(x+y+5\right)\\ i,=\left(x-4\right)^2-24y^2=\left(x-2\sqrt{6}y-4\right)\left(x+2\sqrt{6}y+4\right)\)
\(1,ax+ay+bx+by\)
\(=\left(ax+ay\right)+\left(bx+by\right)\)
\(=a\left(x+y\right)+b\left(x+y\right)\)
\(=\left(x+y\right)\left(a+b\right)\)
\(2,ax+ay+2x+2y\)
\(=\left(ax+ay\right)+\left(2x+2y\right)\)
\(=a\left(x+y\right)+2\left(x+y\right)\)
\(=\left(x+y\right)\left(a+2\right)\)
\(3,ax+ay-bx-by\)
\(=\left(ax+ay\right)-\left(bx+by\right)\)
\(=a\left(x+y\right)-b\left(x+y\right)\)
\(=\left(x+y\right)\left(a-b\right)\)
\(4,ax+ay-2x-2y\)
\(=\left(ax+ay\right)-\left(2x+2y\right)\)
\(=a\left(x+y\right)-2\left(x+y\right)\)
\(=\left(x+y\right)\left(a-2\right)\)
ax + ay + bx + by
= a.(x+y) + b.(x+y)
= (x+y).(a+b)
ax + ay + 2x + 2y
= a.(x+y) + 2.(x+y)
= (x+y).(a+2)
ax + ay - bx - by
= a.(x+y) - b.(x+y)
= (x+y).(a-b)
ax + ay - 2x - 2y
= a.(x+y) - 2.(x+y)
= (x+y).(a-2)