看誰算得又準又快.
2
1
4
×2=
0.99×9+0.99=
9
4
×
1
27
=
1
1
2
×8+1
1
2
×2=
82.5-3.25=
7
10
÷7=
3005-899= 7.25+2.75=
9.8÷98= 0.125×9×8=
1
3
-
1
4
=
5-
5
7
=
4
27
×
9
16
=
2-
2
3
×2=
1
2
-
1
6
=
3
5
+
4
5
=
3
4
+
1
5
=
12-
3
8
=
4
5
×
3
2
=
2
7
×2=
分析:分數(shù)乘整數(shù),用分子和整數(shù)相乘的積作分子,分母不變,能約分的要先約分;除以一個數(shù)(0除外),就等于乘這個數(shù)的倒數(shù);分數(shù)乘分數(shù),分子和分子相乘的積作分子,分母和分母相乘的積做分母,能約分的要先約分;再據(jù)分數(shù)四則混合運算的順序即可進行解答;據(jù)此解答即可求解.
解答:解:

2
1
4
×2=4
1
2
0.99×9+0.99=9.9
9
4
×
1
27
=
1
12
1
1
2
×8+1
1
2
×2=15
82.5-3.25=79.25
7
10
÷7=
1
10
3005-899=2106 7.25+2.75=10
9.8÷98=0.1 0.125×9×8=9
1
3
-
1
4
=
1
12
5-
5
7
=4
2
7
4
27
×
9
16
=
1
12
2-
2
3
×2=
2
3
1
2
-
1
6
=
1
3
3
5
+
4
5
=1
2
5
3
4
+
1
5
=
19
20
12-
3
8
=11
5
8
4
5
×
3
2
=1
1
5
2
7
×2=
4
7
點評:此題主要依據(jù)分數(shù)乘法和乘法的運算法則,以及求分數(shù)四則混合運算的順序.
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