题目内容

350×0.02= 1-25%= 1+15%= 12-7.9=
7
9
×
3
7
=
2
3
-
1
2
=
7
8
-
2
3
)×24=
16×
3
4
=
131131÷131=
7
15
×
1
18
×0=
1
10
-
1
10
÷1=
12.5×0.08=
0.9+99×0.9= 7.8×0.25×4=
7
9
-
5
6
+
2
9
=
0.52×100=
5
4
×8+8×
1
4
=
7
9
×21×
9
14
=
98-0.23-0.77=
7
8
+
7
8
÷
7
8
=
44÷
11
10
=
9300÷5÷6=
1
50
=
1997+1998+1999+6=
分析:根据整数、小数、分数四则运算的计算方法及四则混合运算的运算顺序进行解答.
解答:
解:350×0.02=7, 1-25%=0.75, 1+15%=1.15, 12-7.9=4.1,
7
9
×
3
7
=
1
3
2
3
-
1
2
=
1
6
7
8
-
2
3
)×24=5,
16×
3
4
=12,
131131÷131=1001,
7
15
×
1
18
×0=0,
1
10
-
1
10
÷1=9.9
12.5×0.08=1,
0.9+99×0.9=90, 7.8×0.25×4=7.8,
7
9
-
5
6
+
2
9
=
1
6
0.52×100=52,
5
4
×8+8×
1
4
=12,
7
9
×21×
9
14
=
21
2
98-0.23-0.77=97,
7
8
+
7
8
÷
7
8
=
15
8
=1
7
8
44÷
11
10
=40,
9300÷5÷6=310,
1
50
=0,
1997+1998+1999+6=6000.
点评:此题涉及知识点较多,解答此题的关键是根据整数、小数、分数四则混合运算的运算的顺序进行解答,尤其注意运算定律在计算中的应用.
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