(1) -x= (2)x- - = (3)( + + )x=1.4 (4)5x-2.5x-

(1) -x= (2)x- - = (3)( + + )x=1.4 (4)5x-2.5x-2.5=7.5
2025-05-09 14:58:41
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回答1:

(1) -x=
               x=
(2)x- - =
                    x=1
(3)( + + )x=1.4
                              2x=1.4
                                x=0.7
(4)5x-2.5x-2.5=7.5
                   2.5x=10
                        x= 4