1.3x+2y=3*5+2*3=21
2x-3y=2*5-3*3=1
2.n=s/(a*b)
3.s=a+vt
4.(1)原式=11/2x-1
(2)原式=((-2)+(-3/2)-(-1/4))x=-3.25x
(3)原式=x^2+5x+2
(4)原式=-4x^2y+xy^2-y^3
(5)原式=3x-(-2x+5x)=3x-3x=0
(6)原式=2x+(2x-1)=4x-1
1.3x+2y=3*5+2*3=21
2x-3y=2*5-3*3=1
2.n=s/(a*b)
3.s=a+vt
4.(1)原式=11/2x-1
(2)原式=((-2)+(-3/2)-(-1/4))x=-3.25x
(3)原式=x^2+5x+2
(4)原式=-4x^2y+xy^2-y^3
(5)原式=3x-(-2x+5x)=3x-3x=0
(6)原式=2x+(2x-1)=4x-1