Question

问几道算式，要用简便方法，急用！

算式——
75*76分之3
9.81*0.1+0.5*98.1+0.049*981
56.8*10.1
39.5*3.6+843*0.9
6895.6785/6.785*67.85
3333*6666
需要过程，麻烦了，谢谢！~！

Answer 1

75*76分之3
=（76-1）*（3/76）
=76*3/76-3/76
=3-3/76
=225/76

9.81*0.1+0.5*98.1+0.049*981
=981*0.001+981*0.05+0.049*981
=981*（0.001+0.05+0.49）
=981*0.1
=98.1

56.8*10.1
=56.8*（10+0.1）
=568-5.68
=562.32

39.5*3.6+843*0.9
=39.5*4*0.9+843*0.9
=0.9*（158+843）
=0.9*1001
=900.9

6895.6785/6.785*67.85
这题出错了吧

3333*6666
=3*1111*6*1111
=18*1234321
=（20-2）*1234321
=24686420-2468642
=44435556

Answer 2

3/(75*76)=1/(25*76)=1/(25*(100-6*4))=1/(25*100-25*4*6)=1/(2500-600)=1/1900
9.81*0.1+0.5*98.1+0.049*981=9.81*0.1+5*9.81+4.9*9.81=9.81*(0.1+5+4.9)=98.1
56.8*10.1=56.8*(10+0.1)=56.8*10+56.8*0.1=568+5.68=573.68
39.5*3.6+843*0.9=39.5*4*0.9+843*0.9=157*0.9+843*0.9=0.9(157+843)=0.9*1000=900
6895.6785/6.785*67.85=6895.6785/6.785*6.785*10=6895.6785*10=68956.785
3333*6666=3333*3*2222=9999*2222=(10000-1)*2222=10000*2222-1*2222=22220000-2222=22217778

Answer 3

这个是什么意思呀》你想问什么