题目内容

270÷18= 1.25-0.25+0.75= 3.4-1.4= 99×2.3+2.3=
5-
2
9
+
7
9
=
1
2
+
1
3
-
1
2
+
1
3
=
1
6
+
5
6
=
9
10
-
3
10
=
45×101=
5
9
×6=
2
5
+
1
5
=
4
7
-
2
7
=
5
8
+
1
8
=
1
6
+
1
6
=
2
3
-
1
3
=
9
10
+
1
10
=
7
12
-
5
12
=
25
5
-
10
5
=
1-
2
5
=
1
3
+
2
3
=
分析:根据整数、分数和小数加减乘除的计算方法进行计算.
1.25-0.25+0.75根据加法交换律进行计算简算;
99×2.3+2.3、45×101根据乘法分配律进行简算.
解答:解:
270÷18=15 1.25-0.25+0.75=1.75 3.4-1.4=2 99×2.3+2.3=230
5-
2
9
+
7
9
=5
5
9
1
2
+
1
3
-
1
2
+
1
3
=
2
3
1
6
+
5
6
=1
9
10
-
3
10
=
3
5
45×101=4545
5
9
×6=3
1
3
2
5
+
1
5
=
3
5
4
7
-
2
7
=
2
7
5
8
+
1
8
=
3
4
1
6
+
1
6
=
1
3
2
3
-
1
3
=
1
3
9
10
+
1
10
=1
7
12
-
5
12
=
1
6
25
5
-
10
5
=3
1-
2
5
=
3
5
1
3
+
2
3
=1
点评:口算时,注意运算符号和数据,然后再进一步计算.
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