试题:
24.7-11
2
7
-9
2
7
1-0.125÷
1
8
84×0.25+
1
4
×16
(2.5+3.6)×2
1
4
+3.9×2
1
4
0.875×
1
2
+0.125÷2
1
2
-30%×0.2÷50%

答案:

我来补答
①24.7-11
2
7
-9
2
7

=24.7-(11
2
7
+9
2
7
),
=24.7-20
4
7

=4
9
70


②1-0.125÷
1
8

=1-0125÷0.125,
=1-1,
=0;

③84×0.25+
1
4
×16,
=84×0.25+0.25×16,
=0.25×(84+16),
=0.25×100,
=25;

④(2.5+3.6)×2
1
4
+3.9×2
1
4

=2
1
4
×(2.5+3.6+3.9),
=
9
4
×10,
=22.5;

⑤0.875×
1
2
+0.125÷2,
=0.875×
1
2
+0.125×
1
2

=
1
2
×(0.875+0.125),
=
1
2
×1,
=
1
2


1
2
-30%×0.2÷50%,
=0.5-0.3×0.2×0.5,
=0.5-0.03,
=0.47.
 
 
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