Efetue as expressões
a) -2xy+3xy-5xy=
b)3a+5b-2b+7a=
c)(5x²-2x+3)-(3x²-7x+5)
d) (-3a²).(5ab)=
a) -2xy+3xy-5xy=
b)3a+5b-2b+7a=
c)(5x²-2x+3)-(3x²-7x+5)
d) (-3a²).(5ab)=
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a) -2xy+3xy-5xy= - 4xy
b)3a+5b-2b+7a= 10a + 3b
c)(5x²-2x+3)-(3x²-7x+5) = 5x² - 2x + 3 - 3x² + 7x - 5 ==> 2x² + 5x - 2
d) (-3a²).(5ab) = - 15a^3.b