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.

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