题目内容

用简便方法计算.
25×1.25×32
17.625-(4.4+7
5
8

1
15
+
2
17
)×15×17.
(1)25×1.25×32
=25×1.25×8×4,
=(25×4)×(1.25×8),
=100×10,
=1000;

(2)17.625-(4.4+7
5
8

=17.625-4.4-7.625,
=17.625-7.625-4.4,
=10-4.4,
=5.6;

(3)(
1
15
+
2
17
)×15×17
=
1
15
×15×17+
2
17
×15×17,
=17+30,
=47.
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