3.14xX²+3.14x(X÷2)²=100
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3.14xX²+3.14x(X÷2)²=1003.14xX²+3.14x(X÷2)²=1003.14xX²+3.14x(X÷2)²=1003
3.14xX²+3.14x(X÷2)²=100
3.14xX²+3.14x(X÷2)²=100
3.14xX²+3.14x(X÷2)²=100
3.14xX²+3.14x(X÷2)²=100
这道题,想求的不是x=多少,而是想求大圆面积或者小圆面积是多少吧?
3.14xX²+3.14x(X÷2)²=100
3.14xX²+3.14xX²÷4=100
(1+1/4)3.14xX²=100
3.14xX²=80
大圆面积:80
小圆面积:20
3.14xX²+3.14x(X÷2)²=100
3.14×5/4x²=100
x²=80/3.14
x=±5.0475