问题 解答题
用简便方法计算下列各题
(2+4)×15;5×(20+6);8×23+8×27;9×6+4×9;99×14;
75×99+75;102×36;49×80+80;430-216-184;67×9+33×9;
(13×8)×125;20×(17×5);14×20×5;276×38+276×62;102×26.
答案

(1)(2+4)×15

=2×15+4×15

=30+60

=90

(2)5×(20+6)

=5×20+6×5

=100+30

=130

(3)8×23+8×27

=8×(23+27)

=8×50

=400

(4)9×6+4×9

=9×(6+4)

=9×10

=90

(5)99×14

=(100-1)×14

=100×14-14

=1400-14

=1386

(6)75×99+75

=75×(99+1)

=75×100

=7500

(7)102×36

=(100+2)×36

=100×36+2×36

=3600+72

=3672

(8)49×80+80

=(49+1)×80

=50×80

=4000

(9)430-216-184

=430-(216+184)

=430-400

=30

(10)67×9+33×9

=(67+33)×9

=100×9

=900

(11)(13×8)×125

=13×(8×125)

=13×1000

=13000

(12)20×(17×5)

=(20×5)×17

=100×17

=1700

(13)14×20×5

=14×(20×5)

=14×100

=1400

(14)276×38+276×62

=276×(38+62)

=276×100

=27600

(15)102×26

=(100+2)×26

=100×26+2×26

=2600+52

=2652

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