標題:
中一數學問題`好容易
發問:
要STEP thx2. 0ne number is 18 greater than another number . if the smaller number is subtracted from three times the greater number,the result is 78 . find the sum of the two numbers.3. ABCD is a square . if AB =3x+3 and BC=5x- 11 ,find the area of the square.4 if a triangle has height [10-2x]cm,base... 顯示更多 要STEP thx 2. 0ne number is 18 greater than another number . if the smaller number is subtracted from three times the greater number,the result is 78 . find the sum of the two numbers. 3. ABCD is a square . if AB =3x+3 and BC=5x- 11 ,find the area of the square. 4 if a triangle has height [10-2x]cm,base 9cm and area [7-x]cm2. find the value of x 5.the sum of two numbers is 56 and the difference is 22. find the larger number 更新: 我都唔識轉中文呀s0rry
最佳解答:
2. Let s be the smaller number. Then, the greater number = s+28 3(s+28) - s = 78 3s + 84 - s = 78 2s = -6 s = -3 s+28 = 25 The sum of the two numbers = -3 + 25 The sum of the two numbers = 22 ===== 3. ABCD is a square. Hence, AB = BC 3x+3 = 5x-11 -2x = -14 x = 7 Length of each side = 3(7) + 3 Length of each side = 24 (units) Area of the square = 242 Area of the square = 576 (square units) ===== 4. Area: (1/2)(9)(10-2x) = 7-x 45-9x = 7-x -8x = -38 x = 4.75 ===== 5. Let the larger number be n. Then, the smaller number = n-22 The sum of the two numbers: n + (n-22) = 56 2n - 22 = 56 2n = 78 n = 39 Ans: The larger number is 39. =
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你可唔可以轉中文比我 可以嗎?
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