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. 3.9 × 32 ≈ 4 × 32 = 8 :( ) ()
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15.7 16 ()
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. 3.96 × 4.141 ≈ 4 × 4 = 16
901 ÷ 0.303 ≈ 900 ÷ 0.3 = 9000 ÷ 3 = 3000 ()
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. 69.8 ÷ 0.7 ≈ 70 ÷ 0.7 = 100 ()
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.1×3 = 1×3 = 1
3 5 3×5 5
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. 4 2 ÷ 2 = 14 × 5 = 14 × 5 = 2 × 7 × 5 = 35 = 11 2
3 5 3 2 3×2 3×2 3 3
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. 2 1 ÷ 3 3 = 7 ÷ 15 = 7 × 4 = 28
3 4 3 4 3 15 45
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2 +7 4 + 49
7 2 14
= = 53 × 21 = 21 = 3
53 53 14 53 14 2
21 21