题目内容

脱式计算
32×0.16×2.5×1.25
6.4×4.2-4.2×
2
5

(0.3+
1
5
)×1.6-
4
5

9÷[1-(
2
5
+
9
20
)].
(1)32×0.16×2.5×1.25,
=8×4×0.16×2.5×1.25,
=(8×1.25)×(4×2.5)×0.16,
=10×10×0.16,
=100×0.16,
=16;

(2)6.4×4.2-4.2×
2
5

=4.2×(6.4-0.4),
=4.2×6,
=25.2;

(3)(0.3+
1
5
)×1.6-
4
5

=0.5×1.6-0.8,
=0.8-0.8,
=0;

(4)9÷[1-(
2
5
+
9
20
)],
=9÷[1-
17
20
],
=9÷
3
20

=60.
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