问题
解答题
下面各题怎么简便怎么算.
78÷[32×(1-
0.32×2.5×0.125. |
答案
(1)
×(8 9
-7 16
)÷1 4 1 2
=
×8 9
×2,3 16
=
;1 3
(2)78÷[32×(1-
)+144]5 8
=78÷[32×
+144],3 8
=78÷[12+144],
=78÷156,
=0.5;
(3)
×7 15
-4 5
×2 15 4 5
=(
-7 15
)×2 15
,4 5
=
×1 3
,4 5
=
;4 15
(4)0.32×2.5×0.125
=0.4×0.8×2.5×0.125,
=(0.4×2.5)×(0.8×0.125),
=1×0.1,
=0.1.