(3)=4x? 16y?
(4)4a的4次方-4分之1
7、
(1)=10000 0.04-210
= 9960.04
(2)=4000000 20000 25
=4020025
8、
(1)a? 4ab 4b?-9
(2)x的4次方-x?-6x-9
(3)8xy 12y 6x 18
第九大题没做 - -