1
4
×125×
1
125
×8
1
2
+
1
3
+
1
6
×24
3
7
×(
4
5
-
2
3
)÷
3
15
3
1
8
÷
5
7
+3
1
8
÷
2
7
7
5
6
+8.9+2
1
6
+6.1
0.36×101
20-(5.6+4.8)÷1.3 3.2×(2.15+1.95÷6.5)
4
5
+
1
4
)÷
7
3
+
9
10
36×(
1
4
+
1
6
-
1
3
分析:本題據(jù)四則混合運算法則計算即可:先算乘除,再算加減,有括號的要先算括號里面的.同時要認真分析式中數(shù)據(jù),能簡算的要簡算.
解答:
解:①
1
4
×125×
1
125
×8

      =(
      1
      4
      ×8)×(
      1
      125
      ×125),
      =2×1,
      =1;②
      1
      2
      +
      1
      3
      +
      1
      6
      ×24
      =
      1
      2
      +
      1
      3
      +4,
      =4
      5
      6
      ;

      3
      7
      ×(
      4
      5
      -
      2
      3
      )÷
      3
      15

      =
      3
      7
      ×
      2
      15
      ×
      15
      3
      ,
      =
      2
      7
      ;④3
      1
      8
      ÷
      5
      7
      +3
      1
      8
      ÷
      2
      7

      =
      25
      8
      ×
      7
      5
      +
      25
      8
      ×
      7
      2
      ,
      =
      35
      8
      +
      175
      16
      ,
      =
      245
      16
      ;

      ⑤7
      5
      6
      +8.9+2
      1
      6
      +6.1
      =(7
      5
      6
      +2
      1
      6
      )+(8.9+6.1),
      =10+15,
      =15;

      ⑥0.36×101
      =0.36×100+0.36,
      =36+0.36,
      =36.36;

      ⑦20-(5.6+4.8)÷1.3
      =20-10.4÷1.3,
      =20-8,
      =12;

      ⑧3.2×(2.15+1.95÷6.5)
      =3.2×(2.15+0.3),
      =3.2×2.45,
      =7.84;

      ⑨(
      4
      5
      +
      1
      4
      )÷
      7
      3
      +
      9
      10

      =
      21
      20
      ×
      3
      7
      +
      9
      10
      ,
      =
      9
      20
      +
      9
      10
      ,
      =
      27
      20
      ;
      ⑩36×(
      1
      4
      +
      1
      6
      -
      1
      3

      =36×
      1
      4
      +36×
      1
      6
      -36×
      1
      3

      =9+6-12,
      =3.
      點評:完成此類題目要細心分析數(shù)據(jù),然后據(jù)計算法則和運算定律完成.
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