下面的式子是方程的是请选择DCBA-X/i(g7I:\:G9Z5U.i+N6\4~+i(O6p6R;`7]9n
A．3×8=245U.i+N6\4~+i(O6p6R;`7]9n
B．7x+25U.i+N6\4~+i(O6p6R;`7]9n
C．5x-9=05U.i+N6\4~+i(O6p6R;`7]9n
D．100-x<105U.i+N6\4~+i(O6p6R;`7]9n