计算下面各题(能简算的简算). (1)4/5×3.5+5.5×80%+0.8 (2)11/16+8/13-(11/16-8/13) (3)1/3÷(2/3-2/5)×3/5.
问题描述:
计算下面各题(能简算的简算).
(1)
×3.5+5.5×80%+0.8 4 5
(2)
+11 16
-(8 13
-11 16
)8 13
(3)
÷(1 3
-2 3
)×2 5
. 3 5
答
(1)
×3.5+5.5×80%+0.8 4 5
=(3.5+5.5+1)×0.8
=10×0.8
=8;
(2)
+11 16
-(8 13
-11 16
)8 13
=(
-11 16
)+(11 16
+8 13
)8 13
=0+
16 13
=1
;3 13
(3)
÷(1 3
-2 3
)×2 5
3 5
=
÷1 3
×4 15
3 5
=
×1 3
×15 4
3 5
=
.3 4