
下列各题,怎样算简便怎样算.4.8+1914+1.2 &nb...
下列各题,怎样算简便怎样算.4.8+1914+1.2545+78?145+0.125758-(13+0.635)525?1715?2815....
下列各题,怎样算简便怎样算.4.8+1914+1.2 545+78?145+0.125758-(13+0.635)525?1715?2815.
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(1)4.8+1
+1.2
=4.8+1.2+1
=6+1
=7
;
(2)5
+
?1
+0.125
=(5
-1
)+(
+0.125)
=4+1
=5;
(3)7
-(
+0.635)
=7
-
-0.635
=7
-0.635-
=6.99-
=6
;
(4)5
?1
?2
=5
-(1
+2
)
=5
-4
=1
.
9 |
14 |
=4.8+1.2+1
9 |
14 |
=6+1
9 |
14 |
=7
9 |
14 |
(2)5
4 |
5 |
7 |
8 |
4 |
5 |
=(5
4 |
5 |
4 |
5 |
7 |
8 |
=4+1
=5;
(3)7
5 |
8 |
1 |
3 |
=7
5 |
8 |
1 |
3 |
=7
5 |
8 |
1 |
3 |
=6.99-
1 |
3 |
=6
197 |
300 |
(4)5
2 |
5 |
7 |
15 |
8 |
15 |
=5
2 |
5 |
7 |
15 |
8 |
15 |
=5
2 |
5 |
=1
2 |
5 |
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