赞 wolfhuayong 春芽
共回答了15个问题采纳率：73.3% 举报
（x-0.7）^3 =0.027 ==> x -0.7 = 0.3 ==> x = 0.3 +0.7 ==> x = 1 （x-1）^2-16=0 ==> (x - 1 +4)(x -1 -4) = 0 ==> (x + 3)(x -5) = 0 ==> x =-3,5 125^3+729=0 ==> 125x^3 = -729 ==> x^3 = -(729/125) ==> x = - 9/5
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