7x-5/4=3/8;2x-1/6=5x+1/8;x-1/2+1=x-1;3/10(200+x)-2/10(300-x)=300x9/25;2y-1/3=y+2/4-1;3/4[4/3(1/2...7x-5/4=3/8;2x-1/6=5x+1/8;x-1/2+1=x-1;3/10(200+x)-2/10(300-x)=300x9/25;2y-1/3=y+2/4-1;3/4[4/3(1/2x-1/4)-8]=3/2x+1
问题描述：
7x-5/4=3/8;2x-1/6=5x+1/8;x-1/2+1=x-1;3/10(200+x)-2/10(300-x)=300x9/25;2y-1/3=y+2/4-1;3/4[4/3(1/2...
7x-5/4=3/8;2x-1/6=5x+1/8;x-1/2+1=x-1;3/10(200+x)-2/10(300-x)=300x9/25;2y-1/3=y+2/4-1;3/4[4/3(1/2x-1/4)-8]=3/2x+1
答
因为14x-15=3 所以 x=9/7
解8x-4=15x+3 x=-1
即x-1/2=1 x=3600+3x-600+2x=300x18/5 x=12*18=216;2y-1/3=y+2/4-1
8y-4=3y+6-12 5y=-2 y=-2/5
(1/2x-1/4)-6=3/2x+1 1/2x-3/2x=7+1/4 -2=14x+x/2
-4=29x x=-4/29
答
你这个是什么区别咯
答
14x-15=3 x=9/7; 8x-4=15x+3 x=-1;x-1/2=1 x=3;600+3x-600+2x=300x18/5 x=12*18=216;2y-1/3=y+2/4-1 8y-4=3y+6-12 5y=-2 y=-2/5(1/2x-1/4)-6=3/2x+1 1/2x-3/2x=7+1/4 -2=14x+x/2 -4=29x x=-4/29