Question

99.9×3.4+1999×0.66,的简便运算

Answer 1

99.9x3.4+1999x0.66
=99.9x3.4+(1000+999)x0.66
=99.9x3.4+1000x0.66+999x0.66
=99.9x3.4+660+99.9x(10x0.66)
=99.9x(3.4+6.6)+660
=99.9x10+660
=999+660
=1659

Answer 2

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

Answer 3

99.9×3.4+1999×0.66
=99.9×3.4+99.9×6.6+100*6.6
=99.9*（3.4+6.6）+660
=999+660
=1659

Answer 4

99.9×3.4+1999×0.66
=999×0.34+1999×0.66
=999×0.34+（1000+999）×0.66
=999×0.34+1000×0.66+999×0.66
=999×（0.34+0.66）+1000×0.66
=999×1+660
=（1000-1）+660
=1000+660-1
=1660-1
=1659

Answer 5

99.9×3.4+1999×0.66,的简便运算
99.9×3.4+1999×0.66
=（100-0.1）×3.4+（2000-1）×0.66
=340-0.34+1320-0.66
=240+1320-0.34-0.66
=（240+1320）-（0.34+0.66）
=1660-1
=1659