Question

Cho

M=3/2x mũ 6 - 7x + 4x mũ 5 +2,5x mũ 2

N= -3x mũ 6 + 1/2x mũ 5 - 13/2x mũ 2 + 4x

Tính M+N

M-N

N-M

Giúp mik với 12h minh phải đi học rồi

Đang cần gấp

Answer 1

M+N=(3/2x6-7x+4x^5+2,5x^2)+(-3x^6+1/2^5-13/2x^2+4x)

M+N=3/2x6-7x+4x^5+2,5x^2+-3x^6+1/2^5-13/2x^2+4x

= (3/2x^6-3x^6)+(7x+4x)+(4x^5+1/2^5)+(2,5x^2-13/2x^2)

=-1,5x^6+11x+4,5x^5-4x^2

M-N=(3/2^6-7x+4x^5+2,5x^2)-(-3x^6+1/2^5-13/2x^2+4x)

=3/2^6-7x+4x^5+2,5x^2+3x^6-1/2^5+13/2x^2-4x

= (3/2x^6+3x^6)+(-7x-4x)+(4x^5-1/2^5)+(2,5x^2+13/2x^2)

= 4,5x^6-11x+3,5x^5+9x^2

N-M=(-3x^6+1/2^5-13/2x^2+4x)-(3/2^6-7x+4x^5+2,5x^2)

= -3x^6+1/2^5-13/2x^2+4x-3/2^6-7x-4x^5-2,5x^2

= (-3x^6-3/2x^6)+(1/2x^5-4x^5)+(-13/2x^2-2,5x^2)+(4x-7x)

= -4,5x^6-3,5x^5-9x^2-3x