7.6x-2 +4.5x=72.6?
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解:解方程, 此方程的解为x = 746/121,【即x ≈ 6.17】
7.6x - 2 + 4.5x = 72.6
[(7×10+6)/10]x - 2 + [(4×10+5)/10]x = (72×10+6)/10
(76/10)x - 2 + (45/10)x = 726/10
(76/10)x + (45/10)x = 726/10 + 2
(121/10)x = 726/10 + 20/10
(121/10)x = 746/10
(121/10)x = 373/5
x = 373/5 ÷ 121/10
x = 373/5 × 10/121
x = 746/121
x = 6.165289256
∴x ≈ 6.17
答:此方程的解为x = 746/121,【即x ≈ 6.17】
7.6x - 2 + 4.5x = 72.6
[(7×10+6)/10]x - 2 + [(4×10+5)/10]x = (72×10+6)/10
(76/10)x - 2 + (45/10)x = 726/10
(76/10)x + (45/10)x = 726/10 + 2
(121/10)x = 726/10 + 20/10
(121/10)x = 746/10
(121/10)x = 373/5
x = 373/5 ÷ 121/10
x = 373/5 × 10/121
x = 746/121
x = 6.165289256
∴x ≈ 6.17
答:此方程的解为x = 746/121,【即x ≈ 6.17】
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