計算:(-105)*[(-3分之1)+(+5分之1)+(+7分之1)]

計算:(-105)*[(-3分之1)+(+5分之1)+(+7分之1)]


(-105)×[(-3分之1)+(+5分之1)+(+7分之1)]
=(-105)×(-3分之1)+(-105)×(5分之1)+(-105)×(+7分之1)
=35-21-15
=-1



3.25*4.8+6.7*5.2+3.45*4.8簡算


3.25*4.8+3.45*4.8+6.7*5.2=4.8*(3.25+3.45)+6.7*5.2=6.7*4.8+6.7*5.2=6.7*(4.8+5.2)=67



1.5乘105簡算


1.5x5+1.5x100



1.5乘105如何簡算


1.5*105
=1.5*(100+5)
=150+7.5
=157.5