题目内容

正确、灵活地计算:
①3.2×〔3.25-6÷(1.25+
1
4
)〕
6
11
÷4+
1
4
×
10
11

③1.25×
7
9
×8×27
④1.9-1.9×(1.9-1.9)
①3.2×[3.25-6÷(1.25+
1
4
)],
=3.2×[3.25-6÷1.5],
=3.2×(3.25-4)
=3.2×(-0.75),
=-2.4;

6
11
÷4+
1
4
×
10
11

=
6
11
×
1
4
+
1
4
×
10
11

=
1
4
×(
6
11
+
10
11
),
=
1
4
×
16
11

=
4
11


③1.25×
7
9
×8×27,
=(1.25×8)×(
7
9
×27),
=10×21,
=210;

④1.9-1.9×(1.9-1.9),
=1.9-1.9×0,
=1.9-0,
=1.9.
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