Toán Lớp 6: c, (-3)*X=264
d, x+x+x+x=900
e, 100:(x-7)=1
f, (5x-10):(77x^2+1)=0
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Toán Lớp 6: c, (-3)*X=264
d, x+x+x+x=900
e, 100:(x-7)=1
f, (5x-10):(77x^2+1)=0
Comments ( 2 )
X = 264 : (-3) = -88
Vậy X = -88
d)x + x + x + x = 900
=>4x = 900
x = 900 : 4 = 225
e)100 : (x – 7) = 1
x – 7 = 100 : 1 = 100
x = 100 + 7 = 107
Vậy x = 107
f)(5x – 10) : (77x^{2} + 1) = 0
5x = 0 + 10 = 10
x = 10 : 5 = 2
TH2 : 77x^{2} + 1 = 0
77x^{2} = 0 – 1 = -1
x^{2} = -1 : 77
x^{2} = -1/77 (l)
Vậy x = 2