解题思路:本题据四则混合运算的运算法则计算即可.
(1)4050-6300÷42
=4050-6300÷7÷6,
=4050-150,
=3900;
(2)5.04×6.5-2.76
=32.76-2.76,
=30;
(3)175×
3
10+
7
10×175
=(
3
10+
7
10])×175,
=1×175,
=175;
(5)13÷(
1
4+
5
6)×
3
4
=13÷[13/12×
1
4],
=12×[1/4],
=3;
(6)[8/15×[
5
6÷(
7
9−
1
3)]
=
8
15]×([5/6÷
4
9]),
=[8/15×
45
24],
=1;
点评:
本题考点: 整数、分数、小数、百分数四则混合运算.
考点点评: 完成本题要认真分析各组数据,看是否能进行简便计算.