题目内容

直接写出得数．
5
7
×
14
15
=
1
9
÷
2
3
=
1.25×0.16×8= 2.6-1.7=
44÷
11
10
=
6
7
×
5
9
=
2
3
×
9
4
×
1
2
=
1
2
-
1
5
=
5
8
×16+
1
8
×16=		 0.6+99×0.6=
分析：①⑥⑦约分计算；②⑤把除法改为乘法，再约分计算；③运用乘法交换律与结合律简算；④小数点对齐；⑧通分计算；⑨⑩运用乘法分配律简算．
解答：解：
5
7
×
14
15
=
2
3
1
9
÷
2
3
=
1
6
1.25×0.16×8=1.6 2.6-1.7=0.9
44÷
11
10
=40
6
7
×
5
9
=
10
21
2
3
×
9
4
×
1
2
=
3
4
1
2
-
1
5
=
3
10
5
8
×16+
1
8
×16=12		 0.6+99×0.6=60．
点评：此题考查了分数的约分和通分计算、小数点对齐、运算定律的灵活运用等，根据各自特点，进行解答．
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2
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直接写出得数．
5
7
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1
7
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3
8
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8
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3
5
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2
5
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4
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直接写出得数．
5
7
÷10=
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×
4
9
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5
8
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7
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2
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