Question

Answer 1

1:

a: x^2+y^2

b: (x+y)^3

c: (2a+b)*2h/2=h(2a+b)

d: (x+y)(x^2+y^2)

Answer 2

`1,` `a, x^2+y^2`

`b, (x+y)^3`

`c, (2a+b)/2 *2h`

`d, (x+y)+(x^2+y^2) `

`2,`

`a, A=3,2x^2y^3`

Thay `x=1, y=-1`

`A=3,2*1^2*(-1)^3`

`A=3,2*(-1)=-3,2`

`b, B= 3x-2y`

Thay `x=-2, y=2`

`B= 3*(-2)-2*2`

`B= (-6)-4 = -10`

`c, C=3x^2-5y+1`

Thay \(x=\sqrt{3},y=-1\)

\(C=3\cdot\sqrt{3}^2-5\cdot\left(-1\right)+1\) 

`C= 3*3 - (-5)+1`

`C= 9 + 5 + 1`

`C= 15`