x(x+2.1)=2.1*12.6的解法

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x(x+2.1)=2.1*12.6的解法x(x+2.1)=2.1*12.6的解法x(x+2.1)=2.1*12.6的解法x*x+2.1x=26.46x*x+2.1x+1.1025=26.46+1.10

x(x+2.1)=2.1*12.6的解法
x(x+2.1)=2.1*12.6的解法

x(x+2.1)=2.1*12.6的解法
x*x+2.1x=26.46
x*x+2.1x+1.1025=26.46+1.1025
(x+1.05)(x+1.05)=27.5625
x+1.05=5.25
x=4.2