x-0.6x=0.7

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x-0.6x=0.7x-0.6x=0.7x-0.6x=0.7x-0.6x=0.70.4x=0.7x=7/4x-0.6x=0.70.4x=0.7x=0.7/0.4=7/4X=7/4=1.754X-24=

x-0.6x=0.7
x-0.6x=0.7

x-0.6x=0.7
x-0.6x=0.7
0.4x=0.7
x=7/4

x-0.6x=0.7
0.4x=0.7
x = 0.7/0.4 =7/4

X=7/4=1.75

4X-24=2X+20 2X=44 X=22 2X（X-0.7）=4.8 2X 2;-1.4X-4.8=0 X 2;-0.7X-2.4 =0 ∵a=1.b=-0.7 c=-2.4, Δ

这题算不尽，别做了，想做的话就去问老师。