Odpowiedź:
a) 4 ( 2x-y) + 2 ( 7x+3y )- 12 ( x-y)= 8x -4y +14x +6y -12x +12y= 10x +14y
b) 7b (5+3ax ) - 2bx ( 2a-5b)= 35b +21 abx -4 abx +10 b²x= 10b²x-17abx+35b
c) ( 4a-b) 5 - ( b+2a )9 + 7 ( 3a-4b)= 20a -5b -9b+18a +21a -28b= 59a-42b
d) 12 ( 5a-2) - 8 ( 6a-7b) + 3 ( 3a-12b)= 60a -24 -48a+56b +9a -36b=
=21a+20b-24
Szczegółowe wyjaśnienie:
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Odpowiedź:
a) 4 ( 2x-y) + 2 ( 7x+3y )- 12 ( x-y)= 8x -4y +14x +6y -12x +12y= 10x +14y
b) 7b (5+3ax ) - 2bx ( 2a-5b)= 35b +21 abx -4 abx +10 b²x= 10b²x-17abx+35b
c) ( 4a-b) 5 - ( b+2a )9 + 7 ( 3a-4b)= 20a -5b -9b+18a +21a -28b= 59a-42b
d) 12 ( 5a-2) - 8 ( 6a-7b) + 3 ( 3a-12b)= 60a -24 -48a+56b +9a -36b=
=21a+20b-24
Szczegółowe wyjaśnienie: