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6.5×9.9怎么简便运算

6.5X9.9 =6.5X(10-0.1) =6.5X10-6.5X0.1 =65-0.65 =64.35

=6.5+6.5×99 =6.5×(1+99) =6.5×100 =650

=6.5×(10-0.1) =65-0.65 =64.35

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

6.5×9.9+56.5 =6.5×(10-0.1)+56.5 =6.5×10-6.5×0.1+56.5 =65+56.5-0.65 =121.5-0.65 =120.85

5/6x5/9+5/9x1/6 =5/9x(5/6+1/6) =5/9x1 =5/9

9×5/6 +5/6÷1/9 =9×5/6 +5/6×9 =9×(5/6 +5/6) =9×5/3 =15

13.5×10.1 =13.5*(10+0.1) =135+1.35 =136.35 6.5×9.9 =6.5*(10-0.1) =65-0.65 =64.35

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