Question

化简 a²-4分之4加 a加2分之2 减a-2分之1

Answer 1

(a²-4)分之4+(a+2)分之2-(a-2)分之1

=[(a+2)(a-2)]分之4+[(a+2)(a-2)]分之[2(a-2)]-[(a+2)(a-2)]分之(a+2)

=[(a+2)(a-2)]分之[4+2(a-2)-(a-2)]

=[(a+2)(a-2)]分之(a+2)

=(a-2)分之1