0.5×9-3 x=2.1
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解:解方程,此方程的解为x = 4/5,【即x = 0.8】
0.5 × 9 - 3x = 2.1
5/10 × 9 - 3x = (2×10+1)/10
1/2 × 9 - 3x = 21/10
9/2 - 3x = 21/10
3x = 9/2 - 21/10
3x = 45/10 - 21/10
3x = 24/10
3x = 12/5
x = 12/5 ÷ 3
x = 12/5 × 1/3
x = 4/5
∴x = 0.8
答:此方程的解为x = 4/5,【即x = 0.8】
0.5 × 9 - 3x = 2.1
5/10 × 9 - 3x = (2×10+1)/10
1/2 × 9 - 3x = 21/10
9/2 - 3x = 21/10
3x = 9/2 - 21/10
3x = 45/10 - 21/10
3x = 24/10
3x = 12/5
x = 12/5 ÷ 3
x = 12/5 × 1/3
x = 4/5
∴x = 0.8
答:此方程的解为x = 4/5,【即x = 0.8】
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解:0.5×9-3x=2.1
4.5-2.1=3x
x=0.8
4.5-2.1=3x
x=0.8
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