题目内容

62.8×19-8×62
4
5
-62
4
5

1800-1350÷18×6;
(2
5
12
+1
5
8
+2
7
12
+3.375)×
3
20

1.9-1.9×(1.9-1.9).
(1)62.8×19-8×62
4
5
-62
4
5

=62.8×19-8×62.8-62.8,
=62.8×(19-8-1),
=62.8×10,
=628;

(2)1800-1350÷18×6,
=1800-1350÷9÷2×6,
=1800-75×6,
=1800-450,
=1350;

(3)(2
5
12
+1
5
8
+2
7
12
+
3.375)×
3
20

=[(2
5
12
+2
7
12
)+(1.625+3.375)]×
3
20

=[5+5]×
3
20

=10×
3
20

=1.5;

(4)1.9-1.9×(1.9-1.9),
=1.9-1.9×0,
=1.9-0,
=1.9.
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