-14×3/4-0.34×3/7+1/4×(-14)+4/7×-0.34

-14×3/4-0.34×3/7+1/4×(-14)+4/7×-0.34


-14×3/4-0.34×3/7+1/4×(-14)+4/7×-0.34
=-14×(-3/4-1/4)-0.34×(3/7+4/7)
=-14-0.34
=-14.34



-14×3/4-0.34×3/7+1/4×(-14)+4/7×-0.34(簡便)


-14×3/4-0.34×3/7+1/4×(-14)+4/7×-0.34
=-14x(3/4+1/4)-0.34x(3/7+4/7)
=-14-0.34
=-14.34



1、7,14,23,34,()2、2/7,3/11,1/3,7/19,()3、1,2,4,7,12,()


1、7,14,23,34,(47)差是7,9,11,13相鄰的奇數列.等差為2所以填472、2/7,3/11,1/3,7/19,(11/23)可為:2/7,3/11,5/15,7/19,(11/23)分母等差是4,所以是23分子是,2,3,5,7,11質數列.相鄰,所以是113、1,2,4,7,12,(20)差是1,2,3,5,8,前兩項相加等於第三項.,