Problem 1. In a convex polygon, exactly five of the interior angles are obtuse. Evaluate the largest possible number of sides for this polygon.

Problem 2. Three rugs have a combined area of 200 m2 . By overlapping the rugs to cover a floor area of 140 m2, the area which is covered by exactly two layers of rug is 24 m2 . What area of floor is covered by three layers of rug?

Problem 3. There are four unequal, positive integers a, b, c, and N such that N = 5a + 3b + 5c . It is also true that N = 4a + 5b + 4c and N is between 131 and 150. What is the value of a + b + c?

Bạn nào giỏi Toán giải nhé :x

google giỏi thật.gõ cái xong bài 3.N=5a+3b+5c
N=4a+5b+4c
substracting these two we get
a+c = 2b
put into 1st eqn
we get 13 b

so if b is 11 value of N is between 131 n 150 which is 143.
so 5(a+c) + 33 =143

we get a+c = 22
adding a+b+c = 33




There are four unequal positive integers a, b, c and N, such that N = 5a + 3b + 5c. It is also true that N = 4a + 5b + 4c and N is between 131 and 150

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♥[C]hunnie ♥ 7B đã viết:

Problem 1. In a convex polygon, exactly five of the interior angles are obtuse. Evaluate the largest possible number of sides for this polygon.

Problem 2. Three rugs have a combined area of 200 m2 . By overlapping the rugs to cover a floor area of 140 m2, the area which is covered by exactly two layers of rug is 24 m2 . What area of floor is covered by three layers of rug?

Problem 3. There are four unequal, positive integers a, b, c, and N such that N = 5a + 3b + 5c . It is also true that N = 4a + 5b + 4c and N is between 131 and 150. What is the value of a + b + c?

Bạn nào giỏi Toán giải nhé :x

Cái này bạn Chunnie copy trên web trường mình, hoạt động mỗi tuần một đề toán chứ ở đâu ra

assassin đã viết:

♥[C]hunnie ♥ 7B đã viết:

Problem 1. In a convex polygon, exactly five of the interior angles are obtuse. Evaluate the largest possible number of sides for this polygon.

Problem 2. Three rugs have a combined area of 200 m2 . By overlapping the rugs to cover a floor area of 140 m2, the area which is covered by exactly two layers of rug is 24 m2 . What area of floor is covered by three layers of rug?

Problem 3. There are four unequal, positive integers a, b, c, and N such that N = 5a + 3b + 5c . It is also true that N = 4a + 5b + 4c and N is between 131 and 150. What is the value of a + b + c?

Bạn nào giỏi Toán giải nhé :x

Cái này bạn Chunnie copy trên web trường mình, hoạt động mỗi tuần một đề toán chứ ở đâu ra

bới móc kinh thế?có là tốt rồi