X十2.1X=1.
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X十2.1X=1.
X十2.1X=1.
X十2.1X=1.
收起
x+2.1x=1.55 1x+2.1x=1.55
(1+2.1)x=1.55
3.1x=1.55
3.1x÷3.1=1.55÷3.1
x=0.5
X十2.1X=1.
X十2.1X=1.
X十2.1X=1.
收起
x+2.1x=1.55 1x+2.1x=1.55
(1+2.1)x=1.55
3.1x=1.55
3.1x÷3.1=1.55÷3.1
x=0.5