計算,能簡算要簡算:13/17×11/14+13/14×3/17,3又5/4×{(1-9/10)÷0.01}

計算,能簡算要簡算:13/17×11/14+13/14×3/17,3又5/4×{(1-9/10)÷0.01}


13/17×11/14+13/14×3/17=(13×11)/(14×17)+(13×3)/(14×17)=[(11+3)×13]/(14×17)=(14×13)/(14×17)=13/173又5/4×{(1-9/10)÷0.01}=17/4×(1/10×100)=17/4×10=170/4=85/2=42.5



①(1/2+1/4-3/8)÷1/24②17/16*15+17/16


①(1/2+1/4-3/8)÷1/24
=(1/2+1/4-3/8)*24
=12+6-9
=9
②17/16*15+17/16
=17/16*(15+1)
=17