题目内容

12×
3
4
=		 2×
5
6
=		 1-
3
10
=
2
5
×
1
6
=
1
8
×5=		 42×
9
42
=
1
4
-
1
5
=
2
15
-
1
5
=
3
4
+
3
4
=
1
3
-
1
5
=
分析：整数乘以分数，分母不变，分子直接相乘．不同分母的分数相加减，先通分，再加减．
解答：解：
12×
3
4
=9		 2×
5
6
=
5
3
 1-
3
10
=
7
10
2
5
×
1
6
=
1
15
1
8
×5=
5
8
 42×
9
42
=9
1
4
-
1
5
=
1
20
2
15
+
1
5
=
1
3
3
4
+
3
4
=1
1
2
1
3
-
1
5
=
2
15
点评：此题考查了分数的四则混合运算．
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能简算就要简算
10-2.65= 0.9×0.08= 528-349= 6+14.4=
2.4÷0.04= 400÷125÷8= 19×4×0.5= 12.34-2.3=
0÷3.8= 077+0.33= 675+0.25= 72÷8×4=
5-1.4-1.6= 1125-997= （8700+870+87）÷87= 125×8.8=
13+4.25+3.7+3.75=
（2012?景洪市模拟）
直接写出得数
1
2
+
3
4
=
5
7
÷5=
5
6
+
2
3
+
1
6
=		 1÷3×1÷3=
7.1÷0.01= 1÷
3
8
=		 6.6×10%=
4
9
+
5
9
×0=
1.25×80= 2-
1
2
=
1
2
×
3
4
=		 2.5÷
1
2
=
4
9
×0.18=		 1
2
3
-1
2
3
÷1
2
3
=
4
5
÷0.1=		 1
4
5
×
5
18
=		 3÷1%=
4
7
+1
2
3
+
3
7
=．
直接写出得数．
250-199=
12.6÷0.06=
165﹢98=
2.5-0.05=
2.5×0.4= 12÷
3
4
=		 2-
5
7
=
3
4
÷
4
9
=
1.2×20%=
5
7
×
14
25
=		 205×29≈ 417÷69≈
计算下面各题，能简算的要写出简算过程．
①6.72+2.08×4×1.5
②12.56÷2.5÷0.4
③2.85×4.7+28.5×0.53
④9.88÷[5×（7.34-6.96）]
⑤2.5×3.2×1.25
⑥0.56×99．

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