X=2/5[2/5(1/4X-1)-4又1/2]+4

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X=2/5[2/5(1/4X-1)-4又1/2]+4X=2/5[2/5(1/4X-1)-4又1/2]+4X=2/5[2/5(1/4X-1)-4又1/2]+4最后答案是25/12

X=2/5[2/5(1/4X-1)-4又1/2]+4
X=2/5[2/5(1/4X-1)-4又1/2]+4

X=2/5[2/5(1/4X-1)-4又1/2]+4
最后答案 是 25/12