题目内容

1
4
×
3
8
+
3
4
÷
8
3
+
3
8
．
分析：化
3
4
÷
8
3
=
3
4
×
3
8
，
3
8
=
3
8
×1再运用乘法分配律解答．
解答：解：
1
4
×
3
8
+
3
4
÷
8
3
+
3
8
，
=
1
4
×
3
8
+
3
4
×
3
8
+
3
8
×1，
=
3
8
×（
1
4
+
3
4
+1），
=
3
8
×2，
=
3
4
．
点评：本题考查知识点：正确选择并运用乘法分配律解决问题．
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1.57+3.03= 13.7-5.6= 7.5÷0.1= 0.25×8=
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7
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直接写出得数．
1.57+3.03=		 13.7-5.6= 7.5÷0.1= 0.25×8=
2
3
×12=
1
4
÷
3
8
=
3
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×
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15
=
1
5
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1
6
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3.14×20= 2×
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5
=		 6.4÷0.4= 2-1.05=
4×3.14= 300×0.01%=
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=		 0.42÷8=
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14
=
5
8
÷
2
3
=
1
6
+
2
5
=
2
3
×
3
4
=		 1+
1
2
-0.4=
1
4
+0.75=
1
3
+
2
9
=
6
7
÷9=
1
4
+
1
2
=
5
6
×0.4=		 4÷
8
9
=
1
9
×
1
9
=
（2+
2
5
）×（1+
1
4
）=
2
3
×9=
6
9
+
1
6
=
4÷
1
3
=
1
2
+1
1
3
=		 5-（2+
3
8
）=
4.5÷
1
4
=		 39×
4
13
=		 11×（10+
1
11
）=
11+（3+
2
3
）=
3
5
×
5
6
=		 8×
3
4
=
12-（6+
3
4
）=		 1÷（1+
3
4
）=		 20÷20%=
1÷0.01= 1.12= 9.9÷（1+
4
5
）=
81÷
5
9
=		 1.65-0÷1.65=
2
3
×
4
9
×
1
2
=
5-1.4-1.6= （0.18+0.9）÷9= 8×
3
10
×1.25=
1.25×0.16×8=
5
8
+7.3÷10%=
5
8
+9-0.2=
5.08-0.74-1.26=
1
4
×0.2=		 1-.0375÷
5
8
=
8÷0.5+
1
4
×（1+
1
4
）=		 （
1
12
+
5
6
）×24=		 10（3+
1
7
）÷（3+
1
7
）=
（3+
1
2
+5+
1
3
+2+
1
2
）-（5+
1
3
）=
2
5
+
1
5
÷
2
5
+
1
5
=		 1-
3
10
-
2
5
=
3-（2+
4
9
）+（2+
4
9
）=
3
8
-
3
8
÷3=		 0×（3+
2
9
）+（1+
2
5
）=
1
6
+
1
7
-
1
6
+
1
7
=		 0.125×64×0.125=
5
4
×8+8×
1
4
=
3
8
+
3
4
×16=
5
9
-
5
6
+
4
9
=
计算下面各题，能简算的要简算．
20×
7
12
+4×
7
12
5
8
÷
1
4
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3
8
 23.6×10%+13.6×910% （
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2
-
1
4
）×
3
4
×8．
直接写出得数．
3
8
+
3
4
=
1
6
×
3
8
=		 30×70%= 4÷25%=
5
8
÷
2
3
=
5
6
-
1
4
=
4
9
÷
3
4
=		 8÷
16
7
=		 1.6-
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=		 100×25%=

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