31×99的简便运算

卢泰沾264999*31的简便运算 -
邢岚勇15386271840 ______ 99*31的简便运算=(100-1)x31=100x31-31=3100-31=3069

卢泰沾2649155÷5十31x99的简单计算 -
邢岚勇15386271840 ______ 155÷5+31x99 =31+31*99 =31*(1+99) =31*100 =3100

卢泰沾264930x99的简便计算? -
邢岚勇15386271840 ______ 30*99 =30*(100-1) =30*100-30 =3000-30 =2970

卢泰沾264999*31 99怎样用简便方法计算 -
邢岚勇15386271840 ______ 99*31 =(100-1)*31 =3100-31 =3069

卢泰沾264925/31 - 25/31*99/100简便运算 -
邢岚勇15386271840 ______ 25/31-25/31*99/100 =25/31*(1-99/100) =25/31*1/100 =1/(31*4) =1/124

卢泰沾264999x31十99简便计算 -
邢岚勇15386271840 ______ 99x31十99简便计算 =99*(31+1) =99*32 =3168

卢泰沾2649416/32的简便算法416/32,423+99*423,310
邢岚勇15386271840 ______ 416÷32 =(320+96)÷32 =320÷32+96÷32 =10+3 =13 423+99*423 =423*1+99*423 =(1+99)*423 =100*423 =42300 3100÷(31*25) =3100÷31÷25 =100÷25 =4.

卢泰沾2649405*15+27*99的简便运算是什么? -
邢岚勇15386271840 ______ 简便计算405x15+27x99=400x15+5x15+27x(100-1)=6000+75+27x100-27=6075+2700-27=8775-27=8748

卢泰沾2649352*69+452*31+99*19简便计算 -
邢岚勇15386271840 ______ 353*69+(353+99)*31+99*19=353*69+353*31+99*31+99*19=353*(69+31)+99*(31+19)=35300+(100-1)*50=35300+5000-50=40300-50=40250.

卢泰沾264933*17 99简便计算? -
邢岚勇15386271840 ______ 33*17+99 =33*17+33*3 =33*(17+3) =33*20 =660