30x+50x-x2=25％*50*30

30x+50x-x2=25％*50*30 6x+2x2-3x+x2+1 x=-5这道题这么做对不对6x+2x2-3x+x2+16x+2x2-3x+x2+1 =-30＋50-（-15）+25+1=61我的意思是我的步骤对不 4X+8.60x2=30 4X-X=39 7X+90x7=1463 3X-2+X=50 X=多少 (是小题,格式, （40—X）（20+2X）=1050800+60X-2X²=1050X²-30X+175=0(X-15)²=50可事实是X1=5 X2=25 (X2-5X)+10X2-50X+24=0X=? 50-(4x-3)X2=8 5X2+5x=30 3.5x+1/2x2=30 解方程(x3+7x2+x+30)/(x2+5x+13)=(2x3+11x2+36x+45)/(2x2+7x+20) 因式分解x2+13x+30 4x-(50-x)x2=20解方程 (0.4-x)x2=0.4x(1+50%) 已知集合M={x|x2-2x>0},N={x|x2-4x+30}的详细过程 matlab中求解二元函数的极小值,20分.x0=[22,38];x1=[8,13];x2=[5,81];x3=[52,32];x4=[38,11];x5=[16,12];x6=[81,63];x7=[18,45];x8=[62,12];A=[17,40,60,25,30,15,50,8,35];w=A*[sqrt((x-x0)*(x-x0)`);sqrt((x-x1)*(x-x1)`);sqrt((x-x2)*(x-x2)`);sqrt((x-x 5(x2-x)=3(x2+x) 1.6x2+4X=30 30%X—20%X=X—1.8 解方程组 x+y=1 20%x+30%y=25%x2 7/x2+x+1/x2-x=6/x2-1