问题 解答题
下面各题,怎样简便就怎样计算.
546-127-373
76+141+59+124
2400÷25÷445×9+45
30×28-30×13808×125.
答案

(1)546-127-373

=546-(127+373)

=546-500

=46;

(2)76+141+59+124

=76+124+(141+59)

=200+200

=400;

(3)2400÷25÷4

=2400÷(25×4)

=2400÷100

=24;

(4)45×9+45

=45×(9+1)

=45×10

=450;

(5)30×28-30×13

=30×(28-13)

=30×15

=450;

(6)808×125

=(800+8)×125

=8×125+800×125

=1000+100000

=101000.

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