Question

简便运算请在今天下午两点之前回复小学的

270/45 25*199 6.42*1.01-6.42 (7/10加5/6加4/5)*30 17/24乘于1/5加7/24除以五，加1/5 4.5*9.8 4-5/12减5/4减2/3 3/5乘于153减0.6乘以53 80.7*8.7+8.07*13

• 你的回答被采纳后将获得：
• 系统奖励15（财富值+成长值）+难题奖励30（财富值+成长值）

Answer 1

270÷45
=(270÷9)÷(45÷9)
=30÷5
=6

25×199
=25×(200-1)
=5000-25
=4975

(7/10+5/6-4/5)×30
=7/10×30+5/6×30-4/5×30
=21+25-24
=22

6.42×1.01-6.42
=6.42×(1.01-1)
=6.42×0.01
=0.0642

17/24×1/5+7/24÷5+1/5
=17/24×1/5+7/24×1/5+1/5
=(17/24+7/24+1)×1/5
=2×1/5
=2/5

4.5×9.8
=4.5×(10-0.2)
=45-0.9
=44.1

4-5/12-5/4-2/3
=4-5/12-15/12-8/12
=4-(5/12+15/12+8/12)
=4-2又1/3
=1又2/3

3/5×153-0.6×53
=0.6×153-0.6×53
=0.6×(153-53)
=0.6×100
=60

80.7×8.7+8.07×13
=8.07×87+8.07×13
=8.07×(87+13)
=8.07×100
=807

Answer 2

过了时间点

追答

270÷45
=(270÷9)÷(45÷9)
=30÷5
=6
25×199
=25×(200-1)
=5000-25
=4975
(7/10+5/6-4/5)×30
=7/10×30+5/6×30-4/5×30
=21+25-24
=22
6.42×1.01-6.42
=6.42×(1.01-1)
=6.42×0.01
=0.0642
17/24×1/5+7/24÷5+1/5
=17/24×1/5+7/24×1/5+1/5
=(17/24+7/24+1)×1/5
=2×1/5
=2/5
4.5×9.8
=4.5×(10-0.2)
=45-0.9
=44.1
4-5/12-5/4-2/3
=4-5/12-15/12-8/12
=4-(5/12+15/12+8/12)
=4-2又1/3
=1又2/3
3/5×153-0.6×53
=0.6×153-0.6×53
=0.6×(153-53)
=0.6×100
=60
80.7×8.7+8.07×13
=8.07×87+8.07×13
=8.07×(87+13)
=8.07×100
=807