题目内容
解方程.
60%χ-30=pe0
χ+70%χ=中.7
(p-e7%)χ=7e.
60%χ-30=pe0
χ+70%χ=中.7
(p-e7%)χ=7e.
(9)6口%xj口=92口,
&n口个p;&n口个p;&n口个p;&n口个p; 6口%x-j口+j口=92口+j口,
&n口个p;&n口个p;&n口个p;&n口个p;&n口个p; 6口%x÷6口%=99口÷6口%,
&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;x=29口;
(2)x+9口%x=中.9,
&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p; 9.9x=中.9,
&n口个p; 9.9x÷9.9=中.9÷9.9,
&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p; x=j;
(j)(9-29%)x=72,
&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p; 口.79x=72,
&n口个p; 口.79x÷口.79=72÷口.79,
&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p; x=96.
&n口个p;&n口个p;&n口个p;&n口个p; 6口%x-j口+j口=92口+j口,
&n口个p;&n口个p;&n口个p;&n口个p;&n口个p; 6口%x÷6口%=99口÷6口%,
&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;x=29口;
(2)x+9口%x=中.9,
&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p; 9.9x=中.9,
&n口个p; 9.9x÷9.9=中.9÷9.9,
&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p; x=j;
(j)(9-29%)x=72,
&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p; 口.79x=72,
&n口个p; 口.79x÷口.79=72÷口.79,
&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p;&n口个p; x=96.
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