问题
解答题
|
答案
(1)950÷25,
=(950×4)÷(25×4),
=3800÷100,
=38;
(2)72×12.5×
,1 9
=72×
×12.5,1 9
=8×12.5,
=100;
(3)
-7 8
+7 18
-1 8
,5 18
=(
+7 8
)-(1 8
+7 18
),5 18
=1-
,2 3
=
;1 3
(4)18.5×72+1.85×280,
=18.5×72+18.5×28,
=18.5×(72+28),
=18.5×100,
=1850.