191问答库 > 简便计算过程①1⼀2X1⼀15+1⼀3X1⼀2②5⼀6X5⼀9+5⼀9X1⼀6③3⼀9X7⼀16X2⼀9④2⼀5X4X3⼀4⑤4⼀5X7⼀9X8⼀5⑥5⼀7X16X1⼀5

简便计算过程①1⼀2X1⼀15+1⼀3X1⼀2②5⼀6X5⼀9+5⼀9X1⼀6③3⼀9X7⼀16X2⼀9④2⼀5X4X3⼀4⑤4⼀5X7⼀9X8⼀5⑥5⼀7X16X1⼀5

2024-11-13 11:55:09

推荐回答（2个）

回答1：

俊狼猎英团队为您解答

①1/2X1/15+1/3X1/2
=1/2×1/3×(1/5+1)
=1/6×6/5
=1
②5/6X5/9+5/9X1/6
=1/6×5/9×(5+1)
=5/9
③3/9X7/16X2/9
=1/3×7/8×1/9
=7/216
④2/5X4X3/4
=2/5×3
=6/5
=1又1/5
⑤4/5X7/9X8/5
=224/225
⑥5/7X16X1/5
=1/7×16×1
=16/7
=2又4/7

回答2：

①1/2X1/15+1/3X1/2
=1/2×（1/15+1/3）
=1/2×（1/15+5/15）
=1/2×6/15
=1/2×2/5
=1/5
②5/6X5/9+5/9X1/6
=5/9×（5/6+1/6）
=5/9×1
=5/9
③3/9X7/16X2/9
=1/3×7/8×1/9
=7/216
④2/5X4X3/4
=2/5×1×3
=6/5
⑤4/5X7/9X8/5
=224/225
⑥5/7X16X1/5
=1/7×16
=16/7