已知3x=4,3y=6,求92x-y+27x-y.

问题描述:

已知3x=4,3y=6,求92x-y+27x-y

92x-y+27x-y=92x÷9y+27x÷27y
=(3x4÷(3y2+(3x3÷(3y3
=44÷62+43÷63
=

64
9
+
8
27

=
192
27
+
8
27

=
200
27