题目内容

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
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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