42x37十53x37十37的简算

来源：蜘蛛抓取(WebSpider) 时间：2017-03-21 09:27 标签： 忠者无敌37至42集视频
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shenxinting
年级：五年级
科目：数学
问题名称：
简算：0.125*4*0.8*0.25
5.4*0.8+4.2*0.8
2.34*9.9+0.234
3.7*20+37*48
0.125*4*0.8*0.25
5.4*0.8+4.2*0.8
2.34*9.9+0.234
3.7*20+37*48
收到的回答: 2条
teacher079
0.125*4*0.8*0.25
=0.125*0.8*（4*0.25）
=2.4*10+2.4*0.2
5.4*0.8+4.2*0.8
=0.8*（5.4+4.2）
2.34*9.9+0.234
=0.234*99+0.234
=0.234*（99+1）
=0.234*100
teacher118
1. 0.125*4*0.8*0.25=（0.125*0.8）(4*0.25)=0.1*1=0.1
2. 2.4*10.2=10*2.4+0.2*2.4=24+0.48=24.48
3. 5.4*0.8+4.2*0.8=(5.4+4.2)*0.8=9.6*0.8=7.68
4. 2.34*9.9+0.234=2.34*(9.9+0.1)=2.34*10=23.4
5. 5.38*99=5.38*100-5.38=538-5.38=532.62
6. 0.73*102=0.73*100+0.73*2=73+1.46=74.46
7. 4.8*0.25=1.2*(4*0.25)=1.2
8. 3.2*9+3.2=3.2*(9+1)=32
9. 198*0.51=200*0.51-2*0.51=102-1.02=100.98
10. 5.2*10.1=5.2*10+5.2*0.1=52+0.52=52.52
11. 9.8*25=10*25-0.2*25=250-5=245
12. 3.7*20+37*48=37*(48+2)=37*50=1850
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