(2011•昆明模拟) 计算.8.8-[7/9]-(0.8+[7/9]) [4/29]×〔1-([3/4]-[3/8])
1个回答

解题思路:运用整数、分数、小数和百分数的四则混合运算进行解答,计算时合理利用运算定律进行简算.

8.8-[7/9]-(0.8+[7/9]),

=8.8-[7/9]-0.8-[7/9],

=(8.8-0.8)-[7/9]×2,

=8-[14/9],

=6

4

9;

[4/29]×〔1-([3/4]-[3/8])〕,

=[4/29]×〔1-[3/8]〕,

=[4/29]×[5/8],

=[5/58];

[3/4]×7.8-0.75×2.8-75%,

=(7.8-2.8-1)×0.75,

=4×0.75,

=3;

111×28+999×8,

=111×28+111×72,

=111×(28+72),

=111×100,

=11100,;

[7/9]×8.9+[7/9]×10%,

=[7/9]×(8.9+0.1),

=[7/9]×9,

=7;

2[3/4]+1[5/9]+2.25+3[4/9],

=(2.75+2.25)+(1

5

9+3

4

9),

=5+5,

=10.

点评:

本题考点: 运算定律与简便运算;分数的四则混合运算;整数、分数、小数、百分数四则混合运算.

考点点评: 本题主要考查分数小数百分数的四则混合运算,计算时注意应用运算定律进行简算.