x÷1.2+1.8=3.

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x÷1.2+1.8=3.x÷1.2+1.8=3.x÷1.2+1.8=3.x/1.2+1.8=3.9x=4.68-2.16x=2.52x/1.2=2.1x=2.1*1.2x=2.52x÷1.2+1.8=

x÷1.2+1.8=3.
x÷1.2+1.8=3.

x÷1.2+1.8=3.
x/1.2+1.8=3.9
x=4.68-2.16
x=2.52

x/1.2=2.1
x=2.1*1.2
x=2.52

x÷1.2+1.8=3.9
x÷1.2=3.9-1.8x÷1.2=2.1x=2.52

2.52.。。。

x÷1.2=3.9-1.8
x=(3.9-1.8)1.2
x=2.1×1.2
x=2.52