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用简便方法计算.(1)4.2×0.36+4.2×64%(2)33.6÷8+33.6÷87(3)512+1321+712+821(4)511×[(52+13)÷56].

题目详情
用简便方法计算.
(1)4.2×0.36+4.2×64%                
(2)33.6÷8+33.6÷
8
7

(3)
5
12
+
13
21
+
7
12
+
8
21
                      
(4)
5
11
×[(
5
2
+
1
3
)÷
5
6
].
用简便方法计算.
(1)4.2×0.36+4.2×64%                
(2)33.6÷8+33.6÷
8
7

(3)
5
12
+
13
21
+
7
12
+
8
21
                      
(4)
5
11
×[(
5
2
+
1
3
)÷
5
6
].


8
7

(3)
5
12
+
13
21
+
7
12
+
8
21
                      
(4)
5
11
×[(
5
2
+
1
3
)÷
5
6
].
8
7
878877
5
12
+
13
21
+
7
12
+
8
21
                      
(4)
5
11
×[(
5
2
+
1
3
)÷
5
6
].
5
12
512551212
13
21
+
7
12
+
8
21
                      
(4)
5
11
×[(
5
2
+
1
3
)÷
5
6
].
13
21
132113132121
7
12
+
8
21
                      
(4)
5
11
×[(
5
2
+
1
3
)÷
5
6
].
7
12
712771212
8
21
                      
(4)
5
11
×[(
5
2
+
1
3
)÷
5
6
].
8
21
821882121
5
11
×[(
5
2
+
1
3
)÷
5
6
].
5
11
511551111
5
2
+
1
3
)÷
5
6
].
5
2
525522
1
3
)÷
5
6
].
1
3
131133
5
6
].
5
6
565566
▼优质解答
答案和解析
(1)4.2×0.36+4.2×64% =4.2×0.36+4.2×0.64=4.2×(0.36+0.64)=4.2×1=4.2 (2)33.6÷8+33.6÷87=33.6×18+33.6×78=33.6×(18+78)=33.6×1=33.6(3)512+1321+712+821 =(512+712)+(1321+...