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.