化简 1.(4a²—3a)+(2+4a—a²)—(2a²+a—1)
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化简 1.(4a²—3a)+(2+4a—a²)—(2a²+a—1)
化简 1.(4a²—3a)+(2+4a—a²)—(2a²+a—1)
化简 1.(4a²—3a)+(2+4a—a²)—(2a²+a—1)
(4a²—3a)+(2+4a—a²)—(2a²+a—1)
=4a²-3a+2+4a-a²-2a²-a+1
=a²+3
原式 = 4a^2 - 3a +2+4a-a^2-2a^2 -a +1
= (4 - 1-2)a^2 +(-3+4-1)a+(2+1)
=a^2 +3
a的平方加三