解:2又1/4×6/5等于( 27/10 ),【即等于2.7】 ∵已知需求出2又1/4×6/5等于多少 X × Y = Z ∴2又1/4 × 6/5 = (2×4+1)/4 × 6/5 = 9/4 × 6/5 = 27/10 = 2.7 答:2又1/4×6/5等于27/10,【即等于2.7】
=9/4*6/5=54/20=27/10=2.7