求14题简便计算和答案
答案:1 悬赏:0
解决时间 2021-01-08 16:33
- 提问者网友:感性作祟
- 2021-01-08 07:45
求14题简便计算和答案
最佳答案
- 二级知识专家网友:神也偏爱
- 2021-01-08 09:10
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
=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
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