(100－3x)÷2=8 求x=几

(x-1)(x-2)(x-3)(x-4)=(x+5)(x+6)(x+7)求X等于几? 5x-3x=1 求x等于几? x=2x,求x等于几 15-(7-5x)=2x+(11-3x)求x等于几 已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值 5x=1+2,求X等于几 (100一3x)÷2=8 x=几 几道微积分一,求极限lim x→÷∞ x一,求极限lim x→÷∞ x＋2x／2x－3x＋1二,求极限lim x→1 x 52+2X=3X-1x是几 3^x=2^x,求x.5^(x-1)·10^3x=8^x求x 5.4x+x=12.8,x等于几,求算式 y*y*y*y+2x*x*x*x=4x*x*y 求x等于几,y等于几,写出所有选项!