Odpowiedź:
1) (2x-7y)(3x-2y)=6-4xy-21xy+14=6-25xy+14
2) 2-(x-2)(2x-3)=2-(2-3x-4x+6)= -2+7x-4
3) [4(a+1)-8(a+3)]*(-)=[-4a-20]*(-)=2a+10
4) 4x-(4x+y)(1-2y)= 4x-(4x-8xy+y-2)=4x-4x+8xy-y+2=8xy-y+2
licze na naj :))
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Odpowiedź:
1) (2x-7y)(3x-2y)=6-4xy-21xy+14=6-25xy+14
2) 2-(x-2)(2x-3)=2-(2-3x-4x+6)= -2+7x-4
3) [4(a+1)-8(a+3)]*(-)=[-4a-20]*(-)=2a+10
4) 4x-(4x+y)(1-2y)= 4x-(4x-8xy+y-2)=4x-4x+8xy-y+2=8xy-y+2
licze na naj :))