99.9×3.4+1999×0.66,的简便运算
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99.9×3.4+1999×0.66
=99.9×3.4+199.9×6.6
=99.9×3.4+99.9×6.6+100*6.6
=99.9×（3.4×6.6）+660
=999+660
=1659
=99.9×3.4+199.9×6.6
=99.9×3.4+99.9×6.6+100*6.6
=99.9×（3.4×6.6）+660
=999+660
=1659
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99.9×3.4+1999×0.66的简便运算如下：
99.9×3.4+1999×0.66
=99.9×3.4+(1000+999)×0.66
=99.9×3.4+1000×0.66+999×0.66
=99.9×3.4+999×0.66+1000×0.66
=999×（0.1×3.4）+999×0.66+1000×0.66
=999×(0.34+0.66)+660
=999×1+660
=999+660
=1659
99.9×3.4+1999×0.66
=99.9×3.4+(1000+999)×0.66
=99.9×3.4+1000×0.66+999×0.66
=99.9×3.4+999×0.66+1000×0.66
=999×（0.1×3.4）+999×0.66+1000×0.66
=999×(0.34+0.66)+660
=999×1+660
=999+660
=1659
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99.9×3.4+1999×0.66
=99.9×3.4+199.9×6.6
=99.9×3.4+99.9×6.6+100*6.6
=99.9*（3.4*6.6）+660
=999+660
=1659
=99.9×3.4+199.9×6.6
=99.9×3.4+99.9×6.6+100*6.6
=99.9*（3.4*6.6）+660
=999+660
=1659
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