60X(2⼀5+3⼀4-1⼀2)

2024-12-31 22:20:51
推荐回答(3个)
回答1:

x+3/x+4-x+4/x+5=x+1/x+2-x+2/x+3 (x2+8x+15-x2-8x-16)/(x+4)(x+5)=(x2+4x+3-x2-4x-4)/(x+2)(x+3) -1/(x2+9x+20)=-1/(x2+5x+6) ∴x2+9x+20=x2+5x+6 9x-5x=6-20 4x=-16 x=-4 ∵x=-4原方程无意义, ∴原方程无解

回答2:

60X(2/5+3/4-1/2)
=60x2/5+60x3/4-60x1/2
=24+45-30
=39

回答3: