13又2/13减2.27减7又3/4的簡算
13又2/13-(2.27+7又3/4)=13又2/13-10.02=13又2/13-10又1/50=
9又25/12
16×(4分之3+9分之5)×27簡算,
=4分之3×16×27+9分之5×27×16
=324+240
=564
12×(6分之5-9分之5)×27簡算
12×(6分之5-9分之5)×27
=(12*(5/6)-12*(5/9))*27
=(10-20/3)*27
=27*10-27*(20/3)
=270-180
=90