Toán Lớp 7: Bài 2 : Tìm x,y biết
a) 3/7+1/7 ∶x=3/14
e) 7,2x+(-3,7.x)-2,7=7,8
b) 3.(x-1/2)-5(x+3/5)=-x+1/5 f) 1/4 x^2-3x=0
c) |2x+1|+2/3=2 g) (1/4-x)(x+2/5)=0
d) |2x-3|+|y-5|=0 h) 〖 7〗^(x+2)+2.7^x=357
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Toán Lớp 7: Bài 2 : Tìm x,y biết
a) 3/7+1/7 ∶x=3/14
e) 7,2x+(-3,7.x)-2,7=7,8
b) 3.(x-1/2)-5(x+3/5)=-x+1/5 f) 1/4 x^2-3x=0
c) |2x+1|+2/3=2 g) (1/4-x)(x+2/5)=0
d) |2x-3|+|y-5|=0 h) 〖 7〗^(x+2)+2.7^x=357
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