问题
解答题
你会用简便方法计算吗?
(1)8.25×104
(2)4.28×99
(3)6.3×100.2.
答案
(1)8.25×104,
=8.25×(100+4),
=8.25×100+8.25×4,
=825+33,
=858;
(2)4.28×99,
=4.28×(100-1),
=4.28×100-4.28,
=428-4.28,
=423.72;
(3)6.3×100.2,
=6.3×(100+0.2),
=6.3×100+6.3×0.2,
=630+1.26,
=631.26.