191问答库 > 简便计算18⼀17÷19+1⼀19×16⼀17和(2⼀3+4⼀15×5⼀2)÷20⼀21和0.25×1.25×48

简便计算18⼀17÷19+1⼀19×16⼀17和(2⼀3+4⼀15×5⼀2)÷20⼀21和0.25×1.25×48

2025-03-11 08:12:28

推荐回答（2个）

回答1：

① 18/17÷19+1/19×16/17
=18/17×1/19+1/19×16/17
=1/19 ×（18/17+16/17）
=1/19 × 2
=2/19

② (2/3+4/15×5/2)÷20/21
=（2/3 + 2/3）× 21/20
= 4/3 × 21/20
= 7/5

③ 0.25×1.25×48
= 1/4 × 5/4 ×48
= 5/16 × 48
= 15

回答2：

18/17÷19+1/19×16/17
=1/19×（18/17+16/17）
=1/19×2
=2/19
(2/3+4/15×5/2)÷20/21
=（2/3+2/3）×21/20
=4/3×21/20
=7/5
0.25×1.25×48
=0.25×4×（1.25×4）×3
=1×5×3
=15