解:2÷2.5+2.5÷2等于( 41/20 ),【即等于2.05】
∵已知需求出2÷2.5+2.5÷2等于多少
∴2 ÷ 2.5 + 2.5 ÷ 2
= 2 ÷ (2×10+5)/10 + (2×10+5)/10 × 1/2
= 2 ÷ 25/10 + 25/10 × 1/2
= 2 ÷ 5/2 + 5/2 × 1/2
= 2 × 2/5 + 5/4
= 4/5 + 5/4
= 16/20 + 25/20
= 41/20
= 2.05
答:2÷2.5+2.5÷2等于41/20,【即等于2.05】
=0.8+1.25
=2.05
脱式计算过程如上
原式=2÷5/2+5/2÷2
=2×2/5+5/2×1/2
=4/5+5/4
=41/20