数学简算题10道1.121×100又121分之1(简算)2.2.7×2.75+6.3×2.75+2又4分之3(简算)3.6又2分之1×3.5÷1又3分之2(简算)4.3又8分之1÷8分之5－1又9分之5×1又7分之2(简算)5.2000÷21分之5－3又5分之1×2000第6题.3/8×{3又1/2－2又1/2÷1又1/4}×4/97.7/10×[3/4－(7/16-1/4)]

1.21*（100+1/12）=121*100+1=12101
2. 2.75(2.7+6.3+1)=27.5
3. (13/2)*(7/2)*(3/5)=273/20
4. （25/8)*(8/5)-(14/9)*(9/7)=5-2=3
5. 2000*(21/5)-(16/5)*2000=2000[(21/5)-(16/5)]=2000
6. （3/8）*[(7/2)-(5/2)*(4/5)]*(4/9)=(3/8)*[(7/2)-2)]*(4/9)= (3/8)*(3/2)*(4/9)=1/4
7.(7/10)*[(3/4)-(3/16)]=(7/10)*(9/16)=63/160

1. 100
2. 27.5
3. 273/20
4. 1
5. 2000

1.121*[100（1/121）]=121*100+1=12101
2.提取公因数=2.75(2.7+6.3+1)=27.5
3.都化为假分数=(13/2)*(7/2)*(3/5)=273/20
4.化简,约分=(25/8)*(8/5)-(14/9)*(9/7)=5-2=3
5.化简,提取公因数=2000*(21/5)-(16/5)*2000=2000[(21/5)-(16/5)]=2000
6.化简：（3/8）*[(7/2)-(5/2)*(4/5)]*(4/9)=(3/8)*[(7/2)-2)]*(4/9)= (3/8)*(3/2)*(4/9)=1/4
7.=(7/10)*[(3/4)-(3/16)]=(7/10)*(9/16)=63/160