23x9十27x9.....567-56x7..63x25+25x37用简便方法怎么做

2024-12-28 07:04:13
推荐回答(1个)
回答1:

23x9十27x9
=(23+27)×9
=50×9
=450

56×17-56x7
=56×(17-7)
=56×10
=560

63x25+25x37
=(63+37)×25
=100×25
=2500