35×2/7+5/7×14簡便計算

35×2/7+5/7×14簡便計算


35×2/7+5/7×14
= 35×2/7+5/7×14
=(70 + 70)/7
= 20



-5.35×(-3)+5.35×(-7)+5.35×4簡便運算要過程


-5.35*(-3)+5.35*(-7)+5.35*4=5.35*(-(-3)+(-7)+4)
=5.35*(3-7+4)
=5.35*0
=0