Question

简便计算(六年级)

一.1/8×[1/2÷(3/5×10/9)]
二.(1/2+1/4)÷(4/5÷4-1/10)
三.1/1×5＋1/5×9＋···＋1/17×21
四.55×66÷﹙11×11﹚

最好详细点 谢谢!!

Answer 1

一.1/8×[1/2÷(3/5×10/9)]
=1/8×[1/2÷2/3]
=1/8×[1/2×2/3]
=1/8×1/3
=1/24
二.(1/2+1/4)÷(4/5÷4-1/10)
=(2/4+1/4)÷(1/5-1/10)
=3/4÷1/10
=3/4×10
=15/2
三.1/1×5＋1/5×9＋···＋1/17×21
=1/4(1-1/5)+1/4(1/5-1/9)+....+1/4(1/17-1/21)
=1/4(1-1/5+1/5-1/9+....+1/17-1/21)
=1/4(1-1/21)
=1/4×20/21
=5/21
四.55×66÷﹙11×11﹚
=5×11×6×11÷﹙11×11﹚
=5×6×11×11÷﹙11×11)
=5×6
=30

Answer 2

一.1/8×[1/2÷(3/5×10/9)]
=1/8*[1/2/(2/3)]
=1/8*3
=3/8
二.(1/2+1/4)÷(4/5÷4-1/10)
=3/4/(1/5-1/10)
=3/4*10
=7.5
四.55×66÷﹙11×11﹚
=5*6
=30

Answer 3

3/24
2/15
5/21
30

追问

跟你说详细点 你就是不听!!