7.8一X=4.5 9.1除以X=2.67.8一X=4.5 9.1除以X=2.6

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7.8一X=4.5 9.1除以X=2.67.8一X=4.5 9.1除以X=2.6
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7.8一X=4.5 9.1除以X=2.67.8一X=4.5 9.1除以X=2.6
7.8一X=4.5 9.1除以X=2.6
7.8一X=4.5 9.1除以X=2.6

7.8一X=4.5 9.1除以X=2.67.8一X=4.5 9.1除以X=2.6
(1)7.8-x-7.8=4.5-7.8
-x=-3.3
x=3.3
(2)9.1/x=2.6
9.1=2.6x
x=9.1/2.6
x=91/26

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