
求未知数X. 13x+x=167x-25=13.57:x=4.8
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①
x+x=16,
x=16,
x×
=16×
,
x=12;
②7x-25=13.5,
7x+25-25=13.5+25,
7x=38.5,
7x÷7=38.5÷7,
x=5.5;
③7:x=4.8:9.6,
4.8x=9.6×7,
4.8x÷4.8=9.6×7÷4.8,
x=14.
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x=12;
②7x-25=13.5,
7x+25-25=13.5+25,
7x=38.5,
7x÷7=38.5÷7,
x=5.5;
③7:x=4.8:9.6,
4.8x=9.6×7,
4.8x÷4.8=9.6×7÷4.8,
x=14.
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