標題:
我想問下列幾條數點做呀? 教教我
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發問:
1. Solve the inquality x/3+(x-1)/2 > 1.2. (a) Give that a:b = 2:3 and b:c = 1:2. Find a:b:c. (b) Convert 8610 to binary.3. It shows a hemisphere with radius r cm. The total surface area of hemisphere is A cm2. (a) Express A in terms of r. (b) Change r as the subject of the fornula in part (a). (c)... 顯示更多 1. Solve the inquality x/3+(x-1)/2 > 1. 2. (a) Give that a:b = 2:3 and b:c = 1:2. Find a:b:c. (b) Convert 8610 to binary. 3. It shows a hemisphere with radius r cm. The total surface area of hemisphere is A cm2. (a) Express A in terms of r. (b) Change r as the subject of the fornula in part (a). (c) If total surface area of the hemisphere is 48π cm2, find the radius of the hemisphere.
最佳解答:
1. Solve the inquality x/3+(x-1)/2 > 1. x/3+(x-1)/2 > 1 2x + 3(x-1) > 6 5x - 3 > 6 5x > 9 x > 9/5 ------------------------------------------------------------------- 2. (a) Give that a:b = 2:3 and b:c = 1:2. Find a:b:c. a:b = 2:3 b:c = 1:2 = 3 : 6 a:b:c = 2 : 3 : 6 ------------------------------------------------------------------- (b) Convert 8610 to binary. 8610 = (1)(2^6) + (0)(2^5) + (1)(2^4) + (0)(2^3) + (1)(2^2) + (1)(2^1) + (0)(2^0) = 1010110 (2) ------------------------------------------------------------------- 3. It shows a hemisphere with radius r cm. The total surface area of hemisphere is A cm2. (a) Express A in terms of r. A = π r^2 + 2 π r^2 = 3 π r^2 ------------------------------------------------------------------- (b) Change r as the subject of the fornula in part (a). r^2 = A/(3 π) r = sqrt( A/(3 π) ) ------------------------------------------------------------------- (c) If total surface area of the hemisphere is 48π cm2, find the radius of the hemisphere r = sqrt( 48π/(3 π) ) = sqrt(16) = 4 cm
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