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6.5×9.9怎么简便运算

=6.5+6.5×99 =6.5×(1+99) =6.5×100 =650

6.5+65x9.9 =6.5+6.5x99 =6.5x(1+99) =6.5x100 =650

6.5×9.9+56.5 =6.5x(10-0.1)+56.5 =6.5x10-6.5x0.1+56.5 =65+56.5-0.65 =120.85

5/9×5/6+4/9÷6/5=5/9X5/6+4/9X5/6=5/6

0.65+9.9×6.5 =6.5*0.1+9.9*6.5 =6.5*(0.1+9.9) =6.5*10 =65

5/6×5/9+5/9×1/6 =5/9x(5/6+1/6) =5/9x1 =5/9

9.8x6.5 =(10-0.2)x6.5 =10*6.5-0.2*6.5 =65-1.3 =63.7

妙妙花 发表于 2014-4-3 15:47 说的太好了,学习了 所以啦,赶紧让你家娃练起来~明天我就发一个计算天天练的帖子,大家一起练起来吧!

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