小学1年级10道数学题~ 简便计算，有能力的来啊

1、52又11/25*79.45+159*47.56+79又11/20*52.44
=52.44*79.45+159*47.56+79.55*52.44
=52.44*(79.45+79.55)+159*47.56
=52.44*159+159*47.56
=159*(52.44+47.56)
=159*100
=15900

2、5/9*193+4/9*195
=5/9*（195-2）+4/9*195
=5/9*195-5/9*2+4/9*195
=195*（5/9+4/9）-5/9*2
=195-10/9
=193又8/9

3.2001*20022002-2002*20012001
=2002*20022002-2002*20012001-20022002
=2002*(20022002-20012001)-20022002
=2002*10001-20022002
=2002*(10001-10001)
=0

4、1.9+19.9+199.9+1999.9+19999.9 =(2+20+200+2000+20000)-(0.1+0.1+0.1+0.1+0.1)=22221.5

5.3901*99/（3901*198）*1110
=(3901/3901)*(99/198)*1110
=1*(1/2)*1110
=555

6.10又3/8*18.88+18.88*0.625-188.8*1/10
=10.375*18.88+18.88*0.625-18.88
=18.88*(10.375+0.625-1)
=188.8

7.2002+2001-2000-1999+1998+1997-1996-1995+……+2+1
=(2002+2001-2000-1999)+(1998+1997-1996-1995)+……+2+1
=4+4+4+……+2+1
=4*500+2+1
=2003

8.1/1*2+1/2*3+1/3*4+……+1/10*11
=（1-1/2）+（1/2-1/3）+（1/3-1/4）+（1/4-1/5）+（1/5-1/6）+（1/6-1/7）+（1/7-1/8）+（1/8-1/9）+（1/9-1/10）+（1/10-1/11）
=1-1/11
=10/11

9.1/3+1/15+1/35+1/63+1/99
=1/2*(1-1/3)+1/2*(1/3-1/5)+1/2*(1/5-1/7)+1/2*(1/7-1/9)+
1/2*(1/9-1/11)
=1/2*(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11)
=1/2*10/11
=5/11
10、1又1/2-5/6+7/12+9/20+11/30-13/42+15/56
=（1+1/2）-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7）+（1/7+1/8）
=1+1/2-1/2-1/3+1/3+1/4+1/4+1/5+1/5+1/6-1/6-1/7+1/7+1/8
=1+1/4+1/4+1/5+1/5+1/8
=2.025

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