3×x = 7×b+8= a×1.2×a= 5d－2d= ⅹ·ⅹ =

2、解方程：（24分）

12÷ⅹ=0.3（检验） 6.75 -x=1.68（检验） 0.7x=4.2

0.7x+6×5=37 （10 x－25）÷5=15 2X - 7.5 = 8.5

7.9X - X = 8.97 13(X + 5 ) = 169 4X + 1.2×5 = 24.4

8X - 5X = 27 4X+2.1=8.5 48.34-3.2X=4.5

4X-4=4×6 5X+0.5×3=8.5 8x - 2x = 24

4x －0.95 = 1.8 (10-7.5) x = 0.125 8x + 2x = 24

9X-5.2×6=4.8 24X-8X=28.8 4.5X+1.6X=42.7

(7-1.4)X=2.8 5x － 2.5=8.7 7x ＋ 2x=0.135

9x ÷ 0.3=5.4 8x ＋ 0.4 × 1.2=1.2 12X-9X=8.7