解方程;4.2X-2.5-1.9X=2.1

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解方程;4.2X-2.5-1.9X=2.1解方程;4.2X-2.5-1.9X=2.1解方程;4.2X-2.5-1.9X=2.14.2X-2.5-1.9X=2.12.3x=4.6x=22.3x=4.6x

解方程;4.2X-2.5-1.9X=2.1
解方程;4.2X-2.5-1.9X=2.1

解方程;4.2X-2.5-1.9X=2.1
4.2X-2.5-1.9X=2.1
2.3x=4.6
x=2

2.3x=4.6
x=2

4.2X-2.5-1.9X=2.1
(4.2-1.9)x=2.1+2.5
2.3x=4.6
x=2

X=2

X=(2.1+2.5)/(4.2-1.9)
=2

4.2X-2.5-1.9X=2.1
2.3x=4.6
x=2

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4.2X-2.5-1.9X=2.1
解(4.2-1.9)x=2.1+2.5
2.3x=4.6
x=2