Question

分解因式a²(x-y)-b²(x-y),1.25的4次方分之0.5的4次方×0.4的4次方×12.4的4次方

(a+1)²-(1-a)(－a-1),其中a=3分之4,要过程

Answer 1

a²(x-y)-b²(x-y),
=(x-y)(a²-b²)
=(x-y)(a-b)(a+b)

1.25的4次方分之0.5的4次方×0.4的4次方×12.4的4次方
=0.5^4×0.4^4×12.4^4/1.25^4
=(0.5×0.4×12.4/1.25)^4
=(2.48/1.25)^4
=1.984^4
【这个题目可能有问题。】

(a+1)²-(1-a)(－a-1),其中a=3分之4
=(a+1)²+(1-a)(a+1)
=(a+1)(a+1+1-a)
=2(a+1)
=2×(4/3+1)
=2×7/3
=7/6