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(2)A
(3)C
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X=0.49 x=7.15 x = 4.2
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X =1.9
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X = 3.14
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X = 40
3x=40×3=120
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10 + 10÷2×2 + 10÷2÷2×2 + 10÷2÷2÷2×2 = 27.5 Ã×
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(1)0.85 7Éý50ºÁÉý
(2) 21
(3)4.95 5.0
(4)3.7
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50×4.58=229.00
23×7.60=174.80
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(3)(20.5-10)÷1.5 + 4 = 11(ǧÃ×)
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83+88-86=85(ÈË)
P22-23
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2¡¢ Ìî¿Õ(1)24 8 (2)8 (3)6 315800(д)
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(1)1-5/8=3/8
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2¡¢Ìî¿Õ(1)Á¢·½Ã× ºÁÉý 1800
(2)1/4 17/2 1/25 1/5
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P26-27
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125.5×6=753(Ôª)
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P3031
2¡¢Ìî¿Õ(1)14/27 21/43
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(5)1.6
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3x-13=53
3x=66
X=22
(3)300×2÷(35+65)=6(Ã×)
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8÷4=2(·ÖÃ×) 2×2×8=32(Á¢·½·ÖÃ×)
P3435
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(2) 2 (3)6.8
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6x = 6.3
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