问题 解答题
脱式计算(其中④、⑤两小题必须简算).
①730-240÷15×16
②[2.06-(1.73-0.29)]×1.5
7
12
÷[(
7
16
+
1
4
)×
8
33
]
④6.8+2.37+7.63+4.2
5
8
×17÷9+3÷8×
17
9
答案

①730-240÷15×16,

=730-256,

=474;

②[2.06-(1.73-0.29)]×1.5,

=[2.06-1.44]×1.5,

=0.62×1.5,

=0.93;

7
12
÷[(
7
16
+
1
4
)×
8
33
],

=

7
12
÷[
11
16
×
8
33
],

=

7
12
÷
1
6

=

7
12
×6,

=

7
2

④6.8+2.37+7.63+4.2,

=(6.8+4.2)+(2.37+7.63),

=11+10,

=21;

5
8
×17÷9+3÷8×
17
9

=

5
8
×17×
1
9
+3×
1
8
×
17
9

=

5
8
×
17
9
+
3
8
×
17
9

=(

5
8
+
3
8
)×
17
9

=

17
9

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