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數學幾題...
發問:
1.) slove the following equations:10的x次方=0.012.) slove 2的x+2次方-2x次方=48.3.) after English test, John and David write an expression on the test paper to display their test marks. "^_^" represents 1, while ">_<" represents 0.john... 顯示更多 1.) slove the following equations: 10的x次方=0.01 2.) slove 2的x+2次方-2x次方=48. 3.) after English test, John and David write an expression on the test paper to display their test marks. "^_^" represents 1, while ">_<" represents 0. john 4個^_^,3個>_< david5個^_^,1個>_< A) how many marks did each get in the test in denary scale? b) who had got the highest mark? c) express twicw the difference of their marks in denary scale.
最佳解答:
其他解答:
數學幾題...
發問:
1.) slove the following equations:10的x次方=0.012.) slove 2的x+2次方-2x次方=48.3.) after English test, John and David write an expression on the test paper to display their test marks. "^_^" represents 1, while ">_<" represents 0.john... 顯示更多 1.) slove the following equations: 10的x次方=0.01 2.) slove 2的x+2次方-2x次方=48. 3.) after English test, John and David write an expression on the test paper to display their test marks. "^_^" represents 1, while ">_<" represents 0. john 4個^_^,3個>_< david5個^_^,1個>_< A) how many marks did each get in the test in denary scale? b) who had got the highest mark? c) express twicw the difference of their marks in denary scale.
最佳解答:
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1. 10^x = 0.01 10^x = 1/100 = 1/(10^2) = 10^(-2) x = -2 2. 2^(x+2) - 2^x = 48 2^x(2^2 - 1) = 48 2^x (3) = 48 2^x = 16 2^x = 2^4 x = 4 3. john 1111000 david 111110 A) john 2^6 + 2^5 + 2^4 + 2^3 = 64 + 32 + 16 + 8 = 120 david 2^5 + 2^4 + 2^3 + 2^2 + 2^1 = 32 + 16 + 8 +4 + 2 = 62 B) john C) Twice the difference = 2(120 - 62) = 116 = 1110100 (denary scale)其他解答:
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