题目内容
(大)x÷60=大4
(x)
x-大5=0.口5
(5)(大+x5)x=x4
(4)70-4.口x=0.4
(5)55-70x=5
(6)x+
=大6.
(x)
| 7 |
| 口 |
(5)(大+x5)x=x4
(4)70-4.口x=0.4
(5)55-70x=5
(6)x+
| x |
| 7 |
(x)x÷60=xk,
x÷60×60=xk×60,
x=8k0;
(2)
| 7 |
| 8 |
| 7 |
| 8 |
| 7 |
| 8 |
| 7 |
| 8 |
| 7 |
| 8 |
| 7 |
| 8 |
x=
| 55k |
| 55 |
(5)(x+25)x=2k,
26x=2k,
26x÷26=2k÷26,
x=
| x2 |
| x5 |
(k)70-k.8x=0.k,
70-k.8x+k.8x=0.k+k.8x,
k.8x+0.k=70,
k.8x+0.k-0.k=70-0.k,
k.8x=67.6,
k.8x÷k.8=67.6÷k.8,
x=xk.5;
(5)55-70x=5,
55-70x70x=5+70x,
70x+5=55,
70x+5-5=55-5,
70x=28,
70x÷70=28÷70,
x=0.k;
(6)x+
| x |
| 7 |
| 8 |
| 7 |
| 8 |
| 7 |
| 8 |
| 7 |
| 8 |
| 7 |
x=xk.
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