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用简便方法计算.(要求写出简便过程)15.3-7.28+4.7-2.72(24+67)÷679×511+79÷116

题目详情
用简便方法计算.(要求写出简便过程)
15.3-7.28+4.7-2.72 (24+
6
7
)÷6
7
9
×
5
11
+
7
9
÷
11
6
▼优质解答
答案和解析
(1)15.3-7.28+4.7-2.72,
=15.3+4.7-(7.28+2.72),
=20-10,
=10;

(2)(24+
6
7
)÷6,
=24×
1
6
+
6
7
×
1
6

=4 +
1
7

=4
1
7


(3)
7
9
×
5
11
+
7
9
÷
11
6

=
7
9
× (
5
11
+
6
11
),
=
7
9
×1 ,
=
7
9