问几道算式,要用简便方法,急用!

问题描述:

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

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