问题
解答题
怎样简便就怎么样算.
4.8+2.71+5.2+5.29
35×69+65×69
4×27×25
31.29-3.87-6.13.
答案
(1)4.8+2.71+5.2+5.29,
=(4.8+5.2)+(5.29+2.71),
=10+8,
=18;
(2)35×69+65×69,
=(35+65)×69,
=100×69,
=6900;
(3)4×27×25,
=4×25×27,
=100×27,
=2700;
(4)31.29-3.87-6.13,
=31.29-(3.87+6.13),
=31.29-10,
=21.29.