能
3.14×(10+x)2-3.14x2=200
3.14×(100+20x+x2)-3.14x2=200
314+62.8x+3.14x-3.14x=200
314+62.8x=200
62.8x=-114
x=1.81528662420382
我算的不對(duì)嗎?
3.14×(10+x)²-3.14x²=200,
3.14×(10+x)²-3.14x²=200,
數(shù)學(xué)人氣：160 ℃時(shí)間：2020-06-14 15:01:22
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