The reference answer part is the understanding of a decimal and the significance of decimal addition and subtraction: 6 (1) 9 (2) ten percent, one thousandth (3) 0. 1, individual (4) 0.7, 7, 0.0 12 (5) 8. 50.709 (3) 507.09 (4) 57.009 (the answer is not unique) Measurement activities: 0.4, 0.03, 3.8, 20.02, 6.66, 0.03, 1.345, 0.008, 0.345,/kloc. 108 ⒋××××⒌ ( 1) 0.070, 0.606 (2) 0.50, 0.500 (3) 9.0, 9.00 (4) 96,960, 10, 100 (5) 0.80, 0.8, 8.0.00 1 Shopping receipt: ⒌75.87 yuan, ⒍ (1)1.90 yuan, ⒎66.6 yuan, weight: ⒌ (1) 22.20 4 tons (3) ballpoint pen 3 yuan, pen 5.5 yuan (4) 1 106.95 Yuan 25 1.05 Yuan 2. Understand graphics and graphics classification: 1. Plane graphics 13567 ⑦, three-dimensional graphics 24. 12457 ⑨, 36 triangle classification: 1. Isosceles13456; Right angle 27. Gaga: isosceles right angle; Light blue: equilateral or acute; Komatsu: acute angle; Powerful: right angle. 3.63 ∠ B = 60 ∠ C = 50。 The relationship between the three sides of a triangle: 1. No, yes, yes. Quadrilateral classification: 1. Trapezoid ④, parallelogram 123⑤ digital figure. Unit detection: ⒉×××⒊⒌ AACAC ⒌ (1)14 σ, 2 ⑧, 3 ⒌ 2 126 ⑧. 560kg (1)100 (2) 0.385kg Street Square: 2.22, 0.645,1.18 (1)17kg (2). The slowest reptile in the East: 6 ×××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××× ×××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××× BCABC 1。 XX。 XX。 1 15.5 hours; 1.708 yuan; 6.93 yuan 10)47 kg of apples and 3 kg of baskets 1. 267.2 yuan is enough for two. Looking for 12.6 yuan, mid-term detection105 ××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××× 3 1 day in Tiananmen Square this month: 1. Inspection of units: 1. 3. 3. 3. 2. 2. 2. 933333 0.16 Visiting museums: 6. 2.5 yuan; 1.0.375kg2. 1.25 yuan; 2.5 yuan; 9.22.5 yuan; Who has a long phone call: 1. The first one is 73 kilometers; 1.8 1.25 yuan for 6.5 yuan. Who climbs fast at 0.4m: 1? 0.67km TV advertisement: 1. 1 125 yuan, 1000 yuan, 6. 5438+06.5 pieces (the question is wrong, we all agree that there are not half of the parts produced, so this question can be omitted. ) χ 1 4.85m2 78 ⒏ (1) 6 pens 12 table tennis (2) 58 books (9) △ = 4.8, □=9.2 Passionate Olympics: ⒌ (2) Class 2/kloc-0. Kloc-0/) bcbcbccabc (1)13.3 yuan1) mineral water (per bottle 1.4 yuan; 2) Fanta 4.2 yuan ① is enough for Store 6.