310×60＝ 150×60＝ 1020÷60= 440×30＝ 173×30＝ 2400÷80= 408×40＝ 182×40＝ 3600÷90=
    7387.497+1730
    1060×60＝ 300×60＝ 2100÷210=
    230×40＝ 132×40＝ 1400÷40= 65×20＝ 214×2＝ 3600÷120= 105×200＝ 294×20＝ 5600÷200=
    0.05×(0.46/0.250+0.8/0.231+6.75/0.593)×(1.5^2)/2×1.3×(273+240)/273+0.05×1.5/0.462×3^2/2×1.3×(273+240)/273+0.03×8/0.35×5^2/2×1.3×(273+240)/273
    43×400＝ 172×40＝ 2000÷80= 206×20＝ 140×60＝ 1000÷50= 32×500＝ 151×50＝ 1500÷60=
    2×0.575×0.612/(0.575+0.612)
    2×0.575×0.612/0.575+0.612
    （19-2）×1.5×1
    67×50＝ 221×5＝ 2600÷130= 509×30＝ 183×30＝ 4500÷90= 210×20＝ 130×60＝ 1000÷40=
    508×40＝ 202×40＝ 3300÷110=
    207×30＝ 141×50＝ 1100÷50= 330×40＝ 152×40＝ 1080÷60= 530×40＝ 192×40＝ 2000÷100=
    9×(0.065+0.003)
    0.343/0.575
    0.23×2.5
    7×0.049
    4×0.049
    0.049/0.272
    284.135/(1.6*3600)
    7387.497/26

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