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Tove
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Sep 5, 2012, 7:35:23 PM
9/5/12
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to matema...@googlegroups.com
b)
Kaffe: x kr
Havrekaka: x+5 kr
Ostfralla: 2x kr
Juice: x+7 kr
Kaffe + kaka ska vara 8 kr billigare än fralla + läsk. Hur jag än tecknar uttrycket så blir det fel.
(x + (x+5)) - 8 = (2x + (x+7))
x + x + 5 - 8 = 2x+ x + 7
2x - 3 = 3x + 7
3x - 2x = -3 - 7
x = -10
Kaffet kan väl inte kosta -10 kr..?
Snälla, vill någon vara snäll och hjälpa mig..!?!
Jukjin Chiu
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Sep 5, 2012, 7:56:25 PM
9/5/12
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Det ska inte vara minus 8, för nu har du skrivit att kaffet och havrekakan är 8 kr billigare än ostfrallan och juicen.
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