问题
解答题
脱式计算
105×13-1890÷18
23×[310÷(13+25)].
答案
(1)105×13-1890÷18,
=1365-105,
=1260;
(2)23×[310÷(13+25)],
=23×[310÷38],
=23×
,310 38
=
,7130 38
=187
.12 19
脱式计算
105×13-1890÷18
23×[310÷(13+25)].
(1)105×13-1890÷18,
=1365-105,
=1260;
(2)23×[310÷(13+25)],
=23×[310÷38],
=23×
,310 38
=
,7130 38
=187
.12 19