问题
解答题
灵活计算.
|
答案
(1)
×7 13
+3 4
×3 4
,6 13
=
×(3 4
+6 13
),7 13
=
×1,3 4
=
;3 4
(2)
×0.375+7 8
÷3 8
,8 9
=
×7 8
+3 8
×3 8
,9 8
=
×(3 8
+7 8
),9 8
=
×2,3 8
=
;3 4
(3)(
-1 6
)×54,5 54
=
×54-1 6
×54,5 54
=9-5,
=4;
(4)12.5×0.32×25,
=12.5×8×0.04×25,
=12.5×8×(0.04×25),
=100×1,
=100.