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五点六乘以九点九简便计算

=5.6x(10-0.1)=56-0.56=。。

6.5*9.9=64.35

9.9×(5.4+5.4-1) =9.9×9.8 =(10-0.1)×9.8 =98-0.1×9

3.6*(10-0.1)=36-0.36=35.64

7.49x9.9 =7.49x(10-0.1) =7.49x10-7.49x0.1 =74.9

0.00695*2500+69.5*0.24+5.1*69.5 =6.95*25+6.95*24+

=13.5×(10+0.1)+6.5×(10-0.1) =135+1.35+65-0.65 =200

199.8×6+9.99×80 =(200-0.2)×6+(10-0.01)×80 =200×6

4×(9.3-5.7)+3.6 =4×3.6+1×3.6 =(4+1) ×2×3.6÷2 =1

9.9*8.5=(10-0.1)*8.5=10*8.5-0.1*8.5=85-0.85=84.15

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