问题
解答题
“我能行”,用简便方法计算:
|
答案
(1)(
-7 12
)×60,1 5
=
×60-7 12
×60,1 5
=35-12,
=23;
(2)
×4 7
+6 13
×3 7
,6 13
=(
+4 7
)×3 7
,6 13
=
;6 13
(3)25
×8,3 8
=25×8+
×8,3 8
=200+3,
=203;
(4)
×(15×2 27
)×27 28
,2 15
=(
×2 27
)×(15×27 28
),2 15
=
×2,1 14
=
.1 7