当x等于什么数时,x-(x-1)/3的值与7-(x+3)/5的值相等?
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当x等于什么数时,x-(x-1)/3的值与7-(x+3)/5的值相等?
当x等于什么数时,x-(x-1)/3的值与7-(x+3)/5的值相等?
当x等于什么数时,x-(x-1)/3的值与7-(x+3)/5的值相等?
x-(x-1)/3=7-(x+3)/5
15x-5(x-1)=105-3(x+3)
15x-5x+5=105-3x-9
10x+5=-3x+96
13x=91
x=7
∴当x=7时,x-(x-1)/3的值与7-(x+3)/5的值相等
x-(x-1)/3=7-(x+3)/5
去分母,得15x-5(x-1)=105-3(x+3)
去括号,得15x-5x+5=105-3x-9
移项,得15x-5x +3x= 105-9-5
合并,得13x=91
系数化为1,得 x=7
∴当x=7时,x-(x-1)/3的值与7-(x+3)/5的值相等
x-(x-1)/3=7-(x+3)/5
15x-5(x-1)=105-3(x+3)
15x-5x+5=105-3x-9
7x=91
x=13