( 4 — 473+ — + — )×90 56 1 —÷ 11 + 1 —× 1 — 2 2119 —× 6 —÷ 9 —× 6 — 67671 — : x= 8 — : 0.4 4 7 5 —+ 1 —+ 1 —+ 8 — 696932%x- 23= 63x× 7 —= 3 — 84 7- 1 —+ 4 — 558 —+ 1 —- 1 — 7678 —× 2 —× 9 — 9138
1 1 1 939.9-1= — ÷ — = — ÷ — = 2 2 7 851-11= 19 4 1 980-300= — ÷ — = 50% ÷ — = 9 9 2 30×20= 6 4 1 3770÷70= — + — = — ÷ — = 5 3 6 435-0.2= 1 10.7×0.7= 8 - — = 6 - — =9 81.3÷0.1= 7 6 71.87-0.7= — + — = 2 - — = 6 5 81.1÷0.01= 3 1 4 8258-24= — × — = — × — = 4 2 3 91.5×0.8= 1728 ÷ 16 + 14 × 5 40%x - 16 = 75
4.1 + 3.2 + 5.9 + 6.8 25 × 3.2 × 125
2 : x = 5 : 7.6 7x - 0.5×7 = 9.5
( 4 — 5 7 3 + — + — )×72 4 6 1 — ÷ 41 + 3 — × 1 — 4 4 41 7 — × 2 — ÷ 7 — × 2 — 4 7 4 7 3 — : x = 6 — : 0.3 4 7 3 — + 4 — + 1 — + 1 — 4 5 4 5 8%x + 19 = 40 x - 1 — = 5 — 6 4 5 - 1 — + 2 — 3 3 10 — + 1 — + 1 — 9 2 9 2 — × 2 — × 3 — 3 19 2
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