问题 解答题
用简便方法算.
(1)98700÷25÷4
(2)0.38×
3
5
+0.4×0.38
(3)15.78-(
7
9
+5.78)
答案

(1)98700÷25÷4,

=98700÷(25×4),

=98700÷100,

=987;

(2)0.38×

3
5
+0.4×0.38,

=0.38×0.6+0.4×0.38,

=0.38×(0.6+0.4),

=0.38×1,

=0.38;

(3)15.78-(

7
9
+5.78 ),

=15.78-5.78-

7
9

=10-

7
9

=9

2
9

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