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(1)x(1-x)²=64%x(2)200(1+x)²=1400(3)x(x-1)=2970
题目详情
(1)x(1-x)²=64%x
(2)200(1+x)²=1400
(3)x(x-1)=2970
(2)200(1+x)²=1400
(3)x(x-1)=2970
▼优质解答
答案和解析
(1) a,当x=0时左边等于右边;b,当x不等于0时:(1-x)²=64%得,x=20% 或者x=120%
(2) 等式化简为 (1+x)²=7 得:x=正负根号7 -1
(3) x²-x=2970 即 x²-x+0.25=2970.25 即 (x-0.5)²=2970.25 解得 x=54.5+0.5=55或者x=-54.5+0.5=-54
(2) 等式化简为 (1+x)²=7 得:x=正负根号7 -1
(3) x²-x=2970 即 x²-x+0.25=2970.25 即 (x-0.5)²=2970.25 解得 x=54.5+0.5=55或者x=-54.5+0.5=-54
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