1
8
×
3
5
-0.125×0.5
3.2+(9.2-3.8)÷
1
2
17.6-8.2-2.8
1
9
+
1
8
÷
3
4
+
8
9
1
3
+0.2)×
7
8
÷(3-0.5)
97×
95
98
分析:根據(jù)四則混算的運(yùn)算順序,仔細(xì)審題,選擇恰當(dāng)?shù)倪\(yùn)用運(yùn)算定律進(jìn)行簡(jiǎn)算.
解答:解:①
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    • <tt id="x6mb2"></tt>
      1
      8
      ×
      3
      5
      -0.125×0.5,=0.125×0.6-0.125×0.5,
      =0.125×(0.6-0.5),
      =0.125×0.1,
      =0.0125;

      ②3.2+(9.2-3.8)÷
      1
      2
      ,
      =3.2+5.4×2,
      =3.2+10.8,
      =14;

      ③17.6-8.2-2.8,
      =17.6-(8.2+2.8),
      =17.6-11,
      =6.6;

      1
      9
      +
      1
      8
      ÷
      3
      4
      +
      8
      9
      ,
      =
      1
      9
      +
      1
      8
      ×
      4
      3
      +
      8
      9
      ,
      =(
      1
      9
      +
      8
      9
      )+
      1
      6
      ,
      =1+
      1
      6

      =1
      1
      6
      ;

      ⑤(
      1
      3
      +0.2)×
      7
      8
      ÷(3-0.5),
      =(
      1
      3
      +
      1
      5
      )×
      7
      8
      ÷2.5,
      =
      8
      15
      ×
      7
      8
      ×
      2
      5
      ,
      =
      14
      75
      ;

      ⑥97×
      95
      98
      ,
      =(98-1)×
      95
      98
      ,
      =98×
      95
      98
      -
      95
      98

      =95-
      95
      98
      ,
      =94
      3
      98
      點(diǎn)評(píng):根據(jù)運(yùn)算順序計(jì)算,巧妙運(yùn)用定律進(jìn)行簡(jiǎn)算.
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