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b)a-2a²+5-3a+4a²-3= -2a+2+2a²
c)3y²-3y+3y-y²+6=2y²+6 [-3y+3y sie redukują]
d)0,3c³-0,2c²-0,6c³+c²= -0,3c³+0,8c²
e)3ab-5a²b²-6ab²+2ab+ab²+7a²b²= 5ab+2a²b²-5ab²
f)13a²bc+8abc²-12a²bc-2abc²+5a²bc= 6a²bc+6abc²
b)-2a+2a2+2
c)2y2+6
d)-0,3c3+0,8c2
e)5ab+2a2b2-5ab2
f)6a2bc+6abc