问题
解答题
神机妙算.
42÷7×24 (125+185)×647+25×3
1800-28×735×4+680 420×2+140.
答案
(1)42÷7×24
=6×24
=144;
(2)(125+185)×6
=310×6
=1860;
(3)47+25×3
=47+75
=122;
(4)1800-28×7
=1800-196
=1604;
(5)35×4+680
=140+680
=820;
(6)420×2+140
=840+140
=980.