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计算.(1)1-1519-219(2)33.6×0.78+0.78×16.4(3)1735+15+1835(4)5.4+6.8+4.6+3.2.

题目详情
计算.
(1)1-
15
19
-
2
19

(2)33.6×0.78+0.78×16.4
(3)
17
35
+
1
5
+
18
35

(4)5.4+6.8+4.6+3.2.
▼优质解答
答案和解析
(1)1-
15
19
-
2
19

=1-(
15
19
+
2
19

=1-
17
19

=
2
19


(2)33.6×0.78+0.78×16.4
=(33.6+16.4)×0.78
=50×0.78
=39;

(3)
17
35
+
1
5
+
18
35

=
17
35
+
18
35
+
1
5

=1+
1
5

=1
1
5


(4)5.4+6.8+4.6+3.2
=(5.4+4.6)+(6.8+3.2)
=10+10
=20.