问题
解答题
简便计算:
|
答案
(1)
×(1-75%)+7 8
+0.25×1 4
,1 8
=
×0.25+0.25+0.25×7 8
,1 8
=0.25×(
+1+7 8
),1 8
=0.25×2,
=0.5;
(2)49.5×13.5+50.5×13-0.5×49.5,
=49.5×13.5-0.5×49.5+50.5×13,
=49.5×(13.5-0.5)+50.5×13,
=49.5×13+50.5×13,
=(49.5+50.5)×13,
=100×13,
=1300.