问题 解答题
(1)361-99(2)0.7+3.8+4.2+9.3(3)
3
5
×
1
4
+
3
5
×
3
4
答案

(1)361-99,

=361-100+1,

=261+1,

=262;

(2)0.7+3.8+4.2+9.3,

=(0.7+9.3)+(3.8+4.2),

=10+8,

=18;

(3)

3
5
×
1
4
+
3
5
×
3
4

=

3
5
×(
1
4
+
3
4
),

=

3
5
×1,

=

3
5

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