[急啊]五道小学运算题..本人实在不会..求各位好心人帮忙(好的再高分)

1×0.5 ÷4.2
=0.5÷4.2
=42分之5

24×(1/4+1/3-1/6)
=24×1/4 +24×1/3-24×1/6
=6+8-4
=10

[3/5-(3/4-2/5)]÷4
=[0.6-0.35]×1/4
=0.0625

1498+1068÷89
=1498+12
=1510

4080÷12-24×1.5
=340-36
=304

希望能帮到你!

这么简单都不会做？？
小朋友，你们可是我们祖国的花朵呀，要努力读书，自己看看书自己做吧！！！

1*0.5/4.2=0.5/4.2=1/(2*4.2)=1/8.4=5/42

24×(1/4+1/3-1/6)=24×(3/12+4/12-2/12)=24*(5/12)=10

[3/5-(3/4-2/5)]÷4=(1-3/4)÷4=(1/4)÷4=1/16

1498+1068÷89 =1498+12=1510

4080÷12-24×1.5=340-36=304