搜搜做题作业网99.9×2.22+3.33×3.34
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/13 14:07:17
99.9+99.9=(100-0.1)+(100-0.1)=200-0.2=199.8
6.66*2.22+5.56*3.33=3.33*2*2.22+5.56*3.33=3.33*（4.44+5.56）=3.33*10=33.3
99.9*99.9+199.9=10179.91=99.9×99.9+99.9+100=99.9×(99.9+1)+100=99.9×100.9+100=(100-0.1)×100.9+100=100
3.34×3.33+2.22×9.99=3.34×3.33+2.22×3×3.33=3.34×3.33+6.66×3.33=（3.34+6.66)×3.33=10×3.33=33.3
1.11*72+2.22*246+3.33*12=1.11*72+1.11*492+1.11*36=1.11*（72+492+36）=1.11*600=666
9.99*2.22+3.33*3.34=3.33*3*2.22+3.33*3.34=3.33*(6.66+3.34)=3.33*10=33.3
9.99*2.22+3.33*3.34=3.33*6.66+3.33*3.34=3.33*(6.66+3.64)=3.33*10=33.3
原式=（100……00-1）（100……00-1）+200……00-188个088个088个0=100……00-2×100……00+1+200……00-1176个088个088个0=100……0017
99.9×(1+99)=99.9×100=9990
99.9=(10^100)-1=x原式=x²+[x+(x+1)]=(x+1)²=10^200
9.99乘以2.22加上3.33乘以3.34=3.33×6.66+3.33×3.34=3.33×（6.66+3.34）=3.33×10=33.3
法一=(100-0.1)*(100-1)+99.9=10000-100-10+0.1+99.9=10000-10=9990法二=(100-0.1)*99+99.9=9900+99.9-9.9=9900
99.9*（999+1）=99.9*1000=99900
9.99乘以2.22加3.33乘3.34=3.33*(6.66+3.34).=3.33*10=33.3再问：6.66+3.34是什么意思，9.99和2.22到哪去了？再答：9.99乘以2.22加3.3
99.9×101-99.9=99.9×(101-1)=99.9×100=9990
333×66.6+777×99.9+99.9＝333×（0.3×222）＋777×99.9＋99.9＝（333×0.3）×222＋777×99.9＋99.9＝99.9×222＋777×99.9＋99.
=999*22.2+99.9*778=999*22.2+999*77.8=999*100=99900
=(100-0.1)*99.9=100*99.9-0.1*99.9=9990-9.99=9980.01