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解方程。
χ-χ= 6×-χ= χ+=
χ-χ=12 χ= χ×(+)=
5X-3×= +X= 8x-×3=
(x-6)×=25 6X+5 =13.4 3X=
X- X= 2X + = X×=20×
X+X=121 5X-3×= X÷=12
X÷= X+X= 4X-6×=2
÷X= X = X = ×
X÷ =× 4x-3 ×9 = 29 x + x = 4
X-21×=4 X+X=18 X×( + )=
6X+5 =13.4 X-X= 4χ-6=38
5X= X= X÷=
X÷=12 X= X=×
X÷=÷ X-0.25= 4+0.7X=102
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