问题
解答题
计算题.
|
答案
(1)37.5%×40+
×40,3 8
=(37.5%+
)×40,3 8
=0.75×40,
=30;
(2)
×22%+0.78×40%,2 5
=0.4×22%+0.78×0.4,
=0.4×(22%+0.78),
=0.4×1,
=0.4;
(3)
÷17+12 25
×13 25
,1 17
=
×12 25
+1 17
×13 25
,1 17
=(
+12 25
)×13 25
,1 17
=1×
,1 17
=
;1 17
(4)4.5÷[(10-2.5)×2],
=4.5÷[7.5×2],
=4.5÷15,
=0.3.