数学题”有好心人帮忙算一下!
问题描述：
数学题”有好心人帮忙算一下!
简便
420 ÷ 20
287 ÷ 7
2600 ÷ (13X4)
53000 ÷106
23X164 ÷ 41
540 ÷ 60
答
420 ÷ 20
=7×60÷ 20
=7×(60÷ 20)
=7×3
=21
287 ÷ 7
=(280+7)÷ 7
=280÷ 7+7 ÷ 7
=40+1
=41
2600 ÷ (13X4)
=2600 ÷ 13÷4
=200÷4
=50
53000 ÷106
=53000 ÷(53x2)
=53000 ÷53÷2
=1000÷2
=500
23X164 ÷ 41
=23X(164 ÷ 41)
=23x4
=92
540 ÷ 60
=54÷6
=9