5 —× 4 —÷ 5 —× 4 —6969 1 — : x= 3 — : 0.68 44 —+ 8 —- 1 —+ 1 —5959 1648 ÷16+21×5
5.4+1.7+4.6+8.36- 1 —- 8 — 9910— + 5 —- 1 — 9691 —× 2 —× 2 — 211116%x +17= 50 0.25 ×0.32 × 1.25
8 : x = 5 : 6.3 ( 4 — 3 +
5 — 1
4 +
—
9 )
×108
1 — ÷ 60 + 5 — × 1 — 6 6 60 5 — × 4 — ÷ 5 — × 4 — 8 3 8 3 7 — : x = 7 — : 0.2 6 85x - 0.5 × 8 = 8.580%x - 21 = 48 x - 3 — = 1 — 4 7 7 - 1 — - 5 — 6 6 10 — + 7 — + 1 — 9 4 9
6 — + 1 — + 1 — + 3 — 7 4 7 4 3015 ÷ 15 + 22 × 6
9.5 + 0.7 + 0.5 + 9.3 2 : x = 20 : 4.3 ( 1 — 5 3 + — 1
4 + — )×108
9
2 — × 2 — × 3 — 3 3 2 80%x + 25 = 73 250 × 0.32 × 12.5 5x + 0.5 × 7 = 5.580%x
- 22 = 75
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