题目内容

怎样算简便就怎样计算.
(1)2.8+[2.4÷(90-60)]
(2)0.4×7+
2
5
×3-0.4×3
(3)0.125×0.25×32
(4)
8
21
×
3
4
+
7
12
×
4
7
(1)2.8+[2.4÷(90-60)],
=2.8+[2.4÷30],
=2.8+0.08,
=2.88;

(2)0.4×7+
2
5
×3-0.4×3,
=0.4×7+0.4×3-0.4×3,
=0.4×(7+3-3),
=0.4×7,
=2.8;

(3)0.125×0.25×32,
=0.125×0.25×4×8,
=(0.125×8)×(0.25×4),
=1×1,
=1;

(4)
8
21
×
3
4
+
7
12
×
4
7

=
2
7
+
1
3

=
13
21
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