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Maths Chapter Test!!(急!!)plz

發問:

1.) At least what should be added to 20 to make it a triangular number?2.) The first four pentagonal numbers can be expressed as follows: The first: 1=1 The second: 5=2+3 The third: 12=3+4+5 The fourth: 22=4+5+6+7 Find the seventh and eighth pentagonal numbers.3.) A shop... 顯示更多 1.) At least what should be added to 20 to make it a triangular number? 2.) The first four pentagonal numbers can be expressed as follows: The first: 1=1 The second: 5=2+3 The third: 12=3+4+5 The fourth: 22=4+5+6+7 Find the seventh and eighth pentagonal numbers. 3.) A shop owner buys 100 eggs at $40. If 30% of the eggs are broken and the rest are all sold at $0.5 each,find the profit or loss percent.

最佳解答:

1. 1 2. the seventh: 19+20+21+22+23+24+25=154 the eighth: 26+27+28+29+30+31+32+33=236 3. The loss percent: =<40-[100*(1-30%)*0.5]>/40*100% =5/40*100% =1/8*100% =12.5% <大括號>

其他解答:7638E748CCC65837