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a) 2x+7x=9x
b) -5x+13x-3x= 5x
c) 4x-5y+3x-2y
= 4x+3x - 5y-2y
= 7x-3y
d) 3(x-2y)-3(x+4y) -6x
= 3x-6y-3x+(-12y) -6x
= 3x-3x-6x - 6y+(-12y)
= (-6x) - (-6y)
2.
a) 2p+3=4p-1
2p-4p= (-1) - 3
-2p = -4
p = -4/-2
p = 2
b) (4p-3q) = (p+5q)
4p-p = 5q + 3q
3p = 8q
3p+8q= 11pq
c) (a+3b+c) = (3a+2b-5c)
a-3a+3b-2b+c+5c
-2a+b+6c = 4abc
d) -
3.
a) -9p - 5p
= -14p
b) (3p - 4q) - (5p +q)
= (3p-5p)-(q+4q)
= -2p - 5q
= -7pq
c) (3a - b + c) - (4a+ 3b-2c)
= (3a-4a)-(-b+3b)-(c-2c)
= (-a) - 2b - (-c)
= -2abc
d) -
maaf banget ya kalo salah