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几道简算333*666=2005*20062006-2006*20052005=(44332-443.32)/(88664-886.64)=0.1+0.3+0.5+0.7+0.9+0.11+0.11+0.13+...+0.95-0.97+0.99=100+99-98+97-96...+3-2+1=1989*1999-1988*2000=9999*2222+3333*3334=10*10-9*9+8*8-7*7+...+2*2-1*1=(1+1.2)+(2+1.2*

题目详情
几道简算333*666= 2005*20062006-2006*20052005= (44332-443.32)/(88664-886.64)= 0.1+0.3+0.5+0.7+0.9+0.11+0.11+0.13+...+0.95-0.97+0.99= 100+99-98+97-96...+3-2+1= 1989*1999-1988*2000= 9999*2222+3333*3334= 10*10-9*9+8*8-7*7+...+2*2-1*1= (1+1.2)+(2+1.2*2)+(3+1.2*3)+...+(99+1.2*99)+(100+1.2*100)=
▼优质解答
答案和解析
333*666 =(3*6)*(111*111) =18*12321=221778 2005*20062006-2006*20052005 =2005*2006*10001-2006*2005*10001 =0 (44332-443.32)/(88664-886.64) =(44332-443.32)/88664-(44332-443.32)/886.64 =44332/88664-443.32/88664- 44332/886.64+443.32/886.64 =0.5-0.005-50+0.5 =50.995 0.1+0.3+0.5+0.7+0.9+0.11+0.11+0.13+...+0.95- 0.97+0.99 =(0.1+0.9)*5/2+(0.11+0.99)*[(100-10)/2]/2 =1*5/2+1.1*[90/2]/2 =2.5+1.1*45/2 =2.5+24.75 =27.25 100+99-98+97-96...+3-2+1 =(100+1)+(99-98)+(97-96)+…+(3-2) =101+1*49 =150 1989*1999-1988*2000 =(1988*1999+1999)-(1988*1999-1988) =(1988*1999-1988*1999)+(1999-1988) =11 9999*2222+3333*3334 =3333*(3*2222)+3333*3334 =3333*6666+3333*3334 =3333*(6666+3334) =3333*10000 =33330000 10*10-9*9+8*8-7*7+...+2*2-1*1 =(9*10+9+1-9*9)+(8*7+7+1-7*7)+…+(2*1+1+1-1*1) =(9*2+1)+(8*2+1)+…+(1*2+1) =(1+2+…+10)*2+1*10 =[(1+10)*10/2]*2+10 =(1+10)*10+10 =(1+10+1)*10 =12*10 =120 (1+1.2)+(2+1.2*2)+(3+1.2*3)+...+(99+1.2*99)+ (100+1.2*100) =(1+1.2)*(1+2+…+100) =2.2*[(1+100)*100/2] =2.2*[101*100/2] =2.2*5050 =11110