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解:解方程, 此方程的解为x = 189/50,【即x = 3.78】
13.34 + 2x = 20.9
(13×100+34)/100 + 2x = (20×10+9)/10
1334/100 + 2x = 209/10
667/50 + 2x = 209/10
2x = 209/10 - 667/50
2x = 1045/50 - 667/50
2x = 378/50
2x = 189/25
x = 189/25 ÷ 2
x = 189/25 × 1/2
x = 189/50
∴x = 3.78
答:此方程的解为x = 189/50,【即x = 3.78】
13.34 + 2x = 20.9
(13×100+34)/100 + 2x = (20×10+9)/10
1334/100 + 2x = 209/10
667/50 + 2x = 209/10
2x = 209/10 - 667/50
2x = 1045/50 - 667/50
2x = 378/50
2x = 189/25
x = 189/25 ÷ 2
x = 189/25 × 1/2
x = 189/50
∴x = 3.78
答:此方程的解为x = 189/50,【即x = 3.78】
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