(3.6+2.1)-2.1╳0.3的简便方法?

2025-06-20 14:25:37
推荐回答(2个)
回答1:

解:(3.6+2.1)-2.1╳0.3等于( 507/100 ),【即等于5.07】
∵已知需求出(3.6+2.1)-2.1╳0.3等于多少
∴(3.6 + 2.1) - 2.1 ╳ 0.3
= [(3×10+6)/10 + (2×10+1)/10] - (2×10+1)/10 × 3/10
= (36/10 + 21/10)- 21/10 × 3/10
= 57/10 - 63/100
= 570/100 - 63/100
= 507/100
= 5.07
答:(3.6+2.1)-2.1╳0.3等于507/100,【即等于5.07】

回答2:

直接计算即可
(3.6+2.1)-2.1╳0.3
=5.7-0.63
=5.07