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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-
-
(2)33.6×0.78+0.78×16.4
(3)
+
+
(4)5.4+6.8+4.6+3.2.
(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-
-
=1-(
+
)
=1-
=
;
(2)33.6×0.78+0.78×16.4
=(33.6+16.4)×0.78
=50×0.78
=39;
(3)
+
+
=
+
+
=1+
=1
;
(4)5.4+6.8+4.6+3.2
=(5.4+4.6)+(6.8+3.2)
=10+10
=20.
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.
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