Question

[iamshayuri]

C1, Tính hợp lí:

1, (21/31 + 2013/6039) - (44/53 - 10/31) - 9/53

C2, Tìm x:

1, x + 30% x = -1,31

2, (4,5 - 2x). (-1 4/7) = 11/14

Answer 1

[Nguyễn Lê Phước Thịnh]

Câu 1:

\(=\dfrac{21}{31}+\dfrac{1}{3}-\dfrac{44}{53}+\dfrac{10}{31}-\dfrac{9}{53}=\dfrac{1}{3}\)

Câu 2:

1: =>1,3x=-1,31

=>130x=-131

=>x=-131/130

2: =>(4,5-2x)=11/14:(-11/7)=-7/14=-1/2=-0,5

=>2x=5

=>x=5/2