五年级简便计算
答案:2 悬赏:60 手机版
解决时间 2021-12-24 01:55
- 提问者网友:心牵心
- 2021-12-23 05:50
五年级简便计算
最佳答案
- 五星知识达人网友:猎心人
- 2021-12-23 05:56
75×102
=75*(100+2)
=75*100+75*2
=7500+150
=7650
1.2×2.5
=(1+0.2)*2.5
=1*2.5+0.2*2.5
=2.5+0.5
=3
90.1-9.9
=(90+0.1)-(10-0.1)
=90+0.1-10+0.1
=80+0.2
=80.2
90.1×9.9
=(90+0.1)*(10-0.1)
=900-9+1-0.01
=908-0.01
=907.99
3.54×99+3.54
=3.54*99+3.54*1
=3.54*(99+1)
=3.54*100
=354
272÷125
=272*8/125*8
=2176/1000
=2.176
=75*(100+2)
=75*100+75*2
=7500+150
=7650
1.2×2.5
=(1+0.2)*2.5
=1*2.5+0.2*2.5
=2.5+0.5
=3
90.1-9.9
=(90+0.1)-(10-0.1)
=90+0.1-10+0.1
=80+0.2
=80.2
90.1×9.9
=(90+0.1)*(10-0.1)
=900-9+1-0.01
=908-0.01
=907.99
3.54×99+3.54
=3.54*99+3.54*1
=3.54*(99+1)
=3.54*100
=354
272÷125
=272*8/125*8
=2176/1000
=2.176
全部回答
- 1楼网友:佘樂
- 2021-12-23 06:26
下面是简便运算:
2.34×11-117×0.22
=(2.34×50)×(11÷50)-117×0.22
=117×0.22-117×0.22
=0
19.99×19.98-19.97×19.96
=19.99×(19.97+0.01)-19.97×19.96
=19.97×0.03+0.1999
=0.799
199.199×198-1孩亥粉酵莠寂疯檄弗漏98.198×199
=199.199×198-198.198×(198+1)
=199.199-198.198×198-198.198
=198.198-198.198
=0
18.9×178.178+0.49-17.8×17.8×189.189
=(17.8+1.1)×178.178+0.49-17.8×17.8×189.189
=17.8×(178.178-17.8×189.189)+1.1×178.178+0.49
=-56771.07436+195.9958+0.49
=-56574.58856
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