(1)8+(-4分之1)-5-(0.25) ,
=8-5-(0.25+0.25)
=3-0.5
=2.5
(2) -35÷(-7)x(-7分之1),
=5x(-7分之1),
=-5/7
(3)-1又2分之1-1+1又2分之1×[-(-3分之1)÷4分之1]
=-1又2分之1-1+2分之3×4/3
=-1又2分之1+2
=2分之1
(4)16分之5÷(-4.5)x(-2又15分之2)÷(-9分之4)
=5/16*(-2/9)*32/15*9/4
=-1/3
要采纳先回答的正确答案.是对答题者劳动的尊重.