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=4.59.1除以X=2.67.8一X=4.59.1除以X=2.67.8一X=4.59.1除以X=2.67.8一X=4.59.1除以X=2.67.8一X=4.59.1除以X=2.67.8一X

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
7.8一X=4.5
x=7.8-4.5
x=3.3
9.1除以X=2.6
x=9.1/2.6
x=91/26
x=7/2