Question

Tolong di jawab yg benar ya nomor 3,4, dan 5

Answer 1

3a. (2x+3)+(5+x) = 2x+x+3+5 = 3x+8
b. (x+2y-z)+(2x-y+3z) = x+2x + 2y-y -z+3z = 3x+y+2z
c. (4-2a-6b)+(5a+3b-2) = -2a+5a -6b+3b +4-2 = 3a-3b+2

4a. (10p-8)-(8p-10) = 10p-8p - 8+10 = 2p+2
b. (2-10m+15mn)-(3mn+5m) = 2 -10m-5m +15mn-3mn = 2-15m+12mn
c. (40xy-72yz)-(40xy-45xz) = 40xy-72yz-40xy+45xz = -72yz+45xz

5a. (3xy-12x)+(2x+xy) = 3xy+xy-12x+2x = 4xy-10x
b.(3xy-12x)-(4x+2xy) = 3xy-2xy - 12x-4x = xy-16x
c. (9xy-36x)+(8x+4xy) = 9xy+4xy -36x+8x = 13xy - 28x

Answer 2

3.a.(2x+3)+(5+x)
=2x+x+8
=3x+8
b.(x+2y-z)+(2x-y+3z)
=x+2x+2y-y-z+3z
=3x+y+2z
c.(4-2(a+3b))+(5a+3b-2)
=2a+5a+3b+3b-2
=7a+6b-2
4.a. (10p-8)-(8p-10) =
=10p-8p - 8+10
= 2p+2
b. (2-10m+15mn)-(3mn+5m) =
= 2 -10m-5m +15mn-3mn
= 2-15m+12mn
c. (40xy-72yz)-(40xy-45xz) =
=40xy-72yz-40xy+45xz
= -72yz+45xz
5a. A+B
=(3xy-12x)+(2x+xy)
=4xy-10x
b. A-2B
=(3xy-12x)-(2(2x+xy))
=(3xy-12x)-(4x+2xy)
=xy-16x
c. 3A+4B
=3(3xy-12x)+(4(2x+xy))
=(9xy-36x)+(8x+4xy)
=13xy-28x