求100-500内所有素数的个数?

不定的尘埃2022-10-04 11:39:542条回答

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女人与uu 共回答了14个问题 | 采纳率100%: 这个问题要编程进行运算
用mathematica编程
s = 0; For[i = 100,i; 1年前

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口算：22×2≈84-34=3000+5000=100-500=5+38=36×3≈40×2=4000+8000=900 口算： 22×2≈ 84-34= 3000+5000= 100-500= 5+38= 36×3≈ 40×2= 4000+8000= 900+300= 40÷5= 60÷3= 6×1000= 10000-4000= 1500-800= 90÷3= 60÷2= 21×4= 87×7≈ 71-24= 3000+7000= 80×4= 32×3= 68+17= 39+43= 1400-900= 90×9= 44+46= 6600-600= 700×6= 500+3000= walker_19971年前1: 史末共回答了16个问题 | 采纳率93.8%

解题思路：根据整数加减乘除法的计算方法和乘法的估算方法进行计算．
22×2≈4084-34=503000+5000=8000100-500=-4005+38=43
36×3≈12040×2=804000+8000=12000900+300=120040÷5=8
60÷3=206×1000=600010000-4000=60001500-800=70090÷3=30
60÷2=3021×4=8487×7≈63071-24=473000+7000=10000
80×4=32032×3=9668+17=8539+43=821400-900=500
90×9=81044+46=906600-600=6000700×6=4200500+3000=3500

点评：
本题考点：整数的乘法及应用；整数的加法和减法；整数的除法及应用．

考点点评：口算时，注意运算符号和数据，然后再进一步计算．

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