问题 解答题

递等式计算(能简算的要简算).

(1)191.3-47.2+96.9

(2)9.63+13.78-3.63

(3)50.03-6.5-0.5

(4)25×125×16

(5)2506-506×3+27

(6)99×63+63.

答案

(1)191.3-47.2+96.9,

=144.1+96.9,

=241;

(2)9.63+13.78-3.63,

=9.63-3.63+13.78,

=6+13.78,

=19.78;

(3)50.03-6.5-0.5,

=50.03-(6.5+0.5),

=50.03-7,

=43.03;

(4)25×125×16,

=25×125×(2×8),

=(25×2)×(125×8),

=50×1000,

=50000;

(5)2506-506×3+27,

=2506-1518+27,

=988+27,

=1015;

(6)99×63+63,

=(99+1)×63,

=100×63,

=6300.

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