怎样算简便就怎样算. [(14/19-5/13)+5/19-8/13]÷11/12 34×(1/17+1/13)×13 [1-(1/2-1/4)]×2/3 1375+450÷18×25.
问题描述:
怎样算简便就怎样算.
[(
-14 19
)+5 13
-5 19
]÷8 13
11 12
34×(
+1 17
)×131 13
[1-(
-1 2
)]×1 4
2 3
1375+450÷18×25.
答
(1)[(
-14 19
)+5 13
-5 19
]÷8 13
,11 12
=[
-14 19
+5 13
-5 19
]÷8 13
,11 12
=[
+14 19
-(5 19
+5 13
)]÷8 13
,11 12
=[1-1]÷
,11 12
=0;
(2)34×(
+1 17
)×13,1 13
=34×
×13+34×1 17
×13,1 13
=26+34,
=60;
(3)[1-(
-1 2
)]×1 4
,2 3
=[1-
]×1 4
,2 3
=
×3 4
,2 3
=
;1 2
(4)1375+450÷18×25,
=1375+25×25,
=1375+625,
=2000.