数学题目请教
(199-89)*(4992/48-80) 有巧算吗,小学
﹙199-89﹚×﹙4992/48-80﹚
=110×[﹙4800+192﹚/48-80]
=110×[4800/48+192/48-80]
=110×[100+4-80]
=110×24
=﹙100+10﹚×24
=100×24+10×24
=2400+240
=2640
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(199-89)*(4992/48-80) 有巧算吗,小学
﹙199-89﹚×﹙4992/48-80﹚
=110×[﹙4800+192﹚/48-80]
=110×[4800/48+192/48-80]
=110×[100+4-80]
=110×24
=﹙100+10﹚×24
=100×24+10×24
=2400+240
=2640