（津南区）解方程或解比例． 3×0.7+4x="6.9" 4：=16：x x﹣17.5="0.5" =．
(1–×)÷ [(1–)×]÷4
[(1–)×]÷4++
(–)÷(+)[1–(+)]÷3.5
25÷(–)+–
=16：x 
x﹣17.5="0.5" 
=
．
×
)÷
[(1–
)×
)×
]÷4
+
+
–
)÷(
+
)[1–(
+
)]÷3.5
–
)
+
–
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