(x-2-5÷x 2)÷x-3÷2x 4 化简紧急 、
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(x-2-5÷x 2)÷x-3÷2x 4 化简紧急 、
(x-2-5÷x 2)÷x-3÷2x 4 化简
紧急 、
(x-2-5÷x 2)÷x-3÷2x 4 化简紧急 、
原式=[(x-2)(x+2)-5]/(x+2)×[2(x+2)/(x-3)]
=(x²-4-5)/(x+2)×[2(x+2)/(x-3)]
=(x²-9)/(x+2)×[2(x+2)/(x-3)]
=(x+3)(x-3)/(x+2)×[2(x+2)/(x-3)]
=2(x+2)(x+3)(x-3)/(x+2)(x-3)
=2x+6
圆心(a,2a)
圆心到切线距离等于半径
所以√[(a-3)2+(2a-2)2]=|2a-2a+5|/√(22+12)
平方
5a2-14a+8=0
a=2,a=4/5
r2=5
所以(x-2)2+(y-4)2=5
(x-4/5)2+(y-8/5)2=5
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