75乘以27加19乘以25的简便算法-搜答案-搜搜做题作业网

5.3*99+5.3=5.3*(99+1)=5.3*100=53012.5*35*25=12.5*(8-1)*(4+1)*25=(100-12.5)*(100+25)=10000+2500-1250-

1÷（5*6*7）+1÷（6*7*8）+1÷（7*8*9）=1/7*（1/30+1/48+1/72）=1/7*49/720=7/720

9乘以11分之2加11乘以13分之2加13乘以15分之2加15乘以17分之2加17乘以19分之2=1/9-1/11+1/11-1/13+1/13-1/15+1/15-1/17+1/17-1/19=1/

75*27+19*25=3*25*27+19*25=25*(3*27+19)=25*(81+19)=25*100=2500

（1）：原式=1/11*(36+9*29)=1/11*11*27=27;（2）：原式=(（17*2）/19-1)*19=17*2-19=15;

25×19×40=25×40×19=1000×19=19000

7.2乘以0.2加2.4乘以1.4=2.4×0.6+2.4×1.4=2.4×（0.6+1.4）=2.4×2=4.8

99*99+99*399*（99+1）+99*299*100+99*2（100-1）*100+（100-1）*2

18*45+18*55=18*（45+55）=18*100=1800

原式=1200*5+1800*15+2500*4+3000*2+5000/27=6000+27000+10000+6000+185又5/27=49185又5/27

=6.3*3*9+1.9*3*7=3*56.7+3*13.3=3*(56.7+13.3)=3*(70.0)=210

57*55/56+27*27/28=57*55/56+27*27*2/(28*2)=(57*55+27*54)/56=(57*56-57+27*56-27*2)56=57+27-(57+54)/56=

0.3333乘以23加0.1111乘以31的简便运算=0.1111x3x23+0.1111x31=0.1111x(69+31)=0.1111x100=11.11

5.79*37+5.79*28+5.79*35=5.79*（37+28+35）=5.79*100=579

7.25乘以3.6加1.65乘以0.36加36乘以0.11=7.25x3.6+0.165x3.6+0.011x3.6=(7.25+0.165+0.011)x3.6=7.426x3.6=26.7336

5.7*0.11+11*0.743=5.7*0.11+74.3*0.11=（5.7+74.3）*0.11=8.8

65*15+15*32=15*（65+32）=15*97=15*（100-3）=1500-45=1455

3333乘以3333加9999乘以8889=3333×3×1111+9999×8889=9999×﹙1111+8889）=9999×10000=99990000

172.4×6.2+1724×0.38=172.4×6.2+172.4×3.8=172.4×(6.2+3.8)=172.4×10=1724

1+2+3+.+20=210