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

2.5/9*193+4/9*195

3.2001*20022002-2002*20012001

4.1.9+19.9+199.9+1999.9+19999.9

5.3901*99/（3901*198）*1110

6.10又3/8*18.88+18.88*0.625-188.8*1/10

7.2002+2001-2000-1999+1998+1997-1996-1995+……+2+1

8.1/1*2+1/2*3+1/3*4+……+1/10*11

9.1/3+1/15+1/35+1/63+1/99

10.1又1/2-5/6+7/12+9/20+11/30-13/42+15/56
写完整点，我有的是分．．．（2000分）．．好的加150

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