5.6x+1.4x=15.4求x

5.6x+1.4x=15.4求x 1.4x-x=9.8求x 用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+. 5.6+2X=11.6-3X,求X X-0.36X=16,求X 78-x=5x 求x 66=X+0.25X求X X(X-4)=10000求X X+0.3X=1000 求X? 5.4X+X=12.8求X 求x:x(10^x)=100 2x×x=10,求x X=28.1%*(1000+X)求X 3x-x=0.9求x 14x=12+x 求X X^lgX=100X 求X y=x^x^x求导数 x-0.7x=64.8求x