1.23×9.4+0.77×9.4用脫式計算

1.23×9.4+0.77×9.4用脫式計算


=9.4×(1.23+0.77)
=9.4×2
=18.8



(1-4分之1)×(1-9分之1)×(1-16分之)×······×(1-100分之1)怎麼算


(1-4分之1)×(1-9分之1)×(1-16分之)×······×(1-100分之1)=(1-1/2)(1+1/2)(1-1/3)(1+1/3)(1-1/4)(1+1/4)*.*(1-1/10)(1+1/10)=1/2*3/2*2/3*4/3*3/4*5/4*.*9/10*11/10=1/2*11/10=11/20…