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一、 口算。( 6 分) 60÷20 160÷80 = 30×45 = 210÷30 = 450÷50 180÷90 = 700×3 = 700÷70 = 360÷60 225 - 50 = 600÷20 = 150÷50 = 1500÷30 = 137 + 42 = 270÷90 = 490÷70 = 17×70 = 300÷60 = 44÷4 = 540÷90 = 800 - 400 = 120÷40 = 300÷10 = 340×20 = 280÷70 = 120×30 = 96÷4 = 360÷30 = 720÷80 = 640÷80 = 280 - 190 = 360÷90 = 480÷60 = 170×50 = 1500÷500 = 1200÷60 = 630÷90 = 1800÷300 =
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