2圆 + 1橡 = 3 ==》1圆 = 1.5 – 0.5橡
4钢 + 1橡 = 2 ==》1钢 = 0.5 – 0.25橡
3铅 + 1钢(代入上式)+ 1橡 = 1.4 ==》1铅 = 0.3 – 0.25橡
1铅 + 1钢 + 1圆 + 1橡
= (3铅 + 1钢 + 1 橡)- 2铅 + 1圆
= 1.4 – 2 * (0.3 – 0.25橡) + (1.5 – 0.5橡)
= 1.4 – 0.6 + 1.5
= 2.3
2圆 + 1橡 = 3 ==》1圆 = 1.5 – 0.5橡
4钢 + 1橡 = 2 ==》1钢 = 0.5 – 0.25橡
3铅 + 1钢(代入上式)+ 1橡 = 1.4 ==》1铅 = 0.3 – 0.25橡
1铅 + 1钢 + 1圆 + 1橡
= (3铅 + 1钢 + 1 橡)- 2铅 + 1圆
= 1.4 – 2 * (0.3 – 0.25橡) + (1.5 – 0.5橡)
= 1.4 – 0.6 + 1.5
= 2.3
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