简便运算练习题简便运算:20.09×48-200.9×1.4+2009×0.66要写过程!!
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简便运算练习题简便运算:20.09×48-200.9×1.4+2009×0.66要写过程!!
简便运算练习题
简便运算:20.09×48-200.9×1.4+2009×0.66
要写过程!!
简便运算练习题简便运算:20.09×48-200.9×1.4+2009×0.66要写过程!!
20.09×48-200.9×1.4+2009×0.66
=20.09×48-20.09×14+20.09×66
=20.09×(48-14+66)
=20.09*100
=2009
20.09*4.8*10-20.09*1.4*10+20.09*0.66*100
=20.09*(48-14+66)
=20.09*(34+66)
=20.09*100
=2009
20.09×48-200.9×1.4+2009×0.66
=20.09×48-20.09×14+20.09×66
=20.09×(48-14+66)
=2009
(20+0.9)*48-(200+0.9)*1.4+(2000+9)*0.66
=[20*48+(1-0.1)*48]-[200*1.4+(1-0.1)*1.4]+[2000*0.66+(10-1)*0.66]
剩下可以自己算了
=2009X0.48-2009X0.14+2009X0.66
=2009X(0.48+0.14+0.66)
=2009X1.28
=2571.52
200.9*4.8-200.98*1.4+200.9*6.6
=200.9*(4.8-1.4+6.6)
=200.9*10
=2009
等于2009,有回答我就不多说了