
3.2x6十0.4x=20怎么算解方程?
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解:解方程,此方程的解为x = 2
3.2 x 6 十 0.4x = 20
(3×10+2)/10 × 6 + (4/10)x = 20
32/10 × 6 + (2/5)x = 20
16/5 × 6 + (2/5)x = 20
96/5 + (2/5)x = 20
(2/5)x = 20 - 96/5
(2/5)x = 100/5 - 96/5
(2/5)x = 4/5
x = 4/5 ÷ 2/5
x = 4/5 × 5/2
∴x = 2
答:此方程的解为x = 2
3.2 x 6 十 0.4x = 20
(3×10+2)/10 × 6 + (4/10)x = 20
32/10 × 6 + (2/5)x = 20
16/5 × 6 + (2/5)x = 20
96/5 + (2/5)x = 20
(2/5)x = 20 - 96/5
(2/5)x = 100/5 - 96/5
(2/5)x = 4/5
x = 4/5 ÷ 2/5
x = 4/5 × 5/2
∴x = 2
答:此方程的解为x = 2
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