0.111X9X0.7 0.111X3.7

0.9999*0.7+0.111*27＝0.9999*0.7+0.999*3＝(1-0.0001)*0.7+(1-0.001)*3＝0.7-0.00007+3-0.003＝3.7-0.00307＝3.

0.888*0.8+0.111*1.6=0.111*8*0.8+0.111*1.6=0.111*(6.4+1.6)=0.111*8=0.888

0.999*1.3-0.111*1.7=0.111*11.7-0.111-1.7=0.111*10=1.11

=0.111X9X0.7+0.111X3.7=0.111X(6.3+3.7)=0.111X10=1.11

0.888*0.8+0.111*3.6=0.111*8*0.8+0.111*3.6=0.111*6.4+0.111*3.6=0.111*(6.4+3.6)=0.111*10=1.11

=(2.992+2.992×10+2.992×100)÷0.111=2.992×(1+10+100)÷0.111=2.992×111÷0.111=2.992×1000=2992

(1.992+19.92+199.2)/0.111=(1.992+1.992*10+1.992*100)/0.111=1.992*（1+10+100)/0.111=1.992*111/0.111=19

简便计算：0.999×1.3-0.111×1.7=0.111×9×1.3-0.111×1.7=0.111×11.7-0.111×1.7=0.111×(11.7-1.7)=0.111×10=1.11诚心

0.999*1.3-0.111*2.7+0.001=0.111*（9*1.3-2.7）+0.001=0.111*（11.7-2.7）+0.001=0.999+0.001=1

[(10的N次方)-1]除以九,得数再除以(10的N次方)

0.999*1.3-0.111*2.7=0.999*1.3-0.111*9*0.3=0.999*1.3-0.999*0.3=0.999*(1.3-0.3)=0.999*1=0.999

0.999×0.6+0.111×3.6=0.999x0.6+0.999x0.4=0.999x﹙0.6+0.4﹚=0.999x1=0.999注3.6=9x0.4,0.111x3.6=0.111x9x0.

0.999*1.3-0.111*1.7=0.111x9x1.3-0.111x1.7=0.111x(11.7-1.7)=0.111x10=1.11请好评~在右上角点击【评价】,然后就可以选择【满意,问题

0.999×0.6+0.111×3.6=0.111×5.4+0.111×3.6=0.111×（5.4+3.6）=0.111×10=1.11

令x=0.111…,则10x=1.111.10x-x=19x=1x=1/9

5.9+8.99+12.999+0.111=5.9+8.99+12.999+0.1+0.01+0.001=5.9+0.1+8.99+0.01+12.999+0.001=（5.9+0.1）+（8.99+

9.99*0.13-0.111*2.7=9.99x0.13-0.111x9x0.3=9.99x0.13-0.999x0.3=9.99x0.13-9.99x0.03=9.99x(0.13-0.03)=9

0.111*5.5+0.555*0.9=0.111×5.5+0.111×4.5=0.111×（5.5+4.5）=0.111×10=1.11

原式好像不对哦,应该是这样：0.111*2.7+0.999*0.7=0.111*2.7+0.111*9*0.7=0.111*（2.7+6.3）=0.111*10=1.11