问题补充:
X(X-1)大于或等于(X+3)(X-3)这道题怎没解?急
答案:
X(x-1)>=(x+3)(x-3)
X2-x>=x2-9-x>=-9X======以下答案可供参考======
供参考答案1:
不等式展开得:x^2-x≥x^2-9
移项得:9≥x
所以解为:x≤9
供参考答案2:
x²-x≥x(x-3)+3(x-3)
x²-x≥x²-3x+3x-9
x²-x≥x²-9
x²-x²-x≥-9
-x≥-9-x*(-1)≤-9*(-1)
x≤9
时间:2021-10-25 02:03:01
X(X-1)大于或等于(X+3)(X-3)这道题怎没解?急
X(x-1)>=(x+3)(x-3)
X2-x>=x2-9-x>=-9X======以下答案可供参考======
供参考答案1:
不等式展开得:x^2-x≥x^2-9
移项得:9≥x
所以解为:x≤9
供参考答案2:
x²-x≥x(x-3)+3(x-3)
x²-x≥x²-3x+3x-9
x²-x≥x²-9
x²-x²-x≥-9
-x≥-9-x*(-1)≤-9*(-1)
x≤9