Question

化简[(3a-2b)(3a+2b)-(a+2b)(5a-2b)]÷4a,其中a=(1/2)^0,b=-1^-1

Answer 1

[(3a-2b)(3a+2b)-(a+2b)(5a-2b)]÷4a
=[3a²-4b²-5a²-8ab+4b²]÷4a
=（-2a²-8ab）÷4a
=-1/2a-2b
因为 a=(1/2)^0,b=-1^-1
a=0
b=-1
原式就=2
祝学习进步

Answer 2

[(3a-2b)(3a+2b)-(a+2b)(5a-2b)]÷4a
=(9a^2-4b^2-5a^2-8ab+4b^2)÷4a
=(4a^2-8ab)÷4a
=a-2b
=(1/2)^0-2*-1^-1
=1+2
=3