脱式计算①907×99×907②（45+14）÷73+710③（0.125×8-0.5）×4④[1-（12-14）]×23．

Question

脱式计算
①907×99×907
②（ (4)/(5) + (1)/(4) ）÷ (7)/(3) + (7)/(10)
③（0.125×8-0.5）×4
④[1-（ (1)/(2) - (1)/(4) ）]× (2)/(3) ．

Answer 1

①907×99×907
=89793×907
=81442251；
②（ (4)/(5) + (1)/(4) ）÷ (7)/(3) + (7)/(10)
= (21)/(20) × (3)/(7) + (7)/(10)
= (9)/(20) + (14)/(20)
=1 (3)/(20) ；
③（0.125×8-0.5）×4
=（1-0.5）×4
=0.5×4
=2；
④[1-（ (1)/(2) - (1)/(4) ）]× (2)/(3)
={1- (1)/(4) }× (2)/(3)
= (3)/(4) × (2)/(3)
= (1)/(2) ．