精品文档---下载后可任意编辑解方程X－ X= 2X + = 70%X + 20%X = X× =20× 25% + 10X = X - 15%X = 68X＋ X＝121 5X－3×＝ X÷ ＝126X＋5 = 3X=精品文档---下载后可任意编辑X÷ = X＋ X= 4X－6× =2 ÷X= X = X = × X÷ =× 4x－3 ×9 = 29 x + x = 4X－21× =4 6X＋5 = X-X= 4χ－6＝38精品文档---下载后可任意编辑5X= X= X÷ =X÷ =12 X= X= ×X÷=÷ = =30% 4+=102 X+ X=42 X+ X=105精品文档---下载后可任意编辑 X- X=400 =8 = X+X=18 X×( + )= x－= x× + =4× X－ X＝12 5 X－×5＝8×5- x = (x- = 7 x- 25%x = 10x- = 16+6 20 x– = x- x -4= 21 精品文档---下载后可任意编辑X＋25%X=90 X－X= (1) χ+χ=6 (2): χ=5: (3)χ－χ=(4)= (5)6×3－χ= (6)17－5χ=+3 (7) = (8) χ－ χ= (9)× －2χ=8(10)= (11) × －χ=
