小学四年级倍数奥数题 小学四年级数学题什么是因数和倍数和因数
100\u9053\u5c0f\u5b66\u56db\u5e74\u7ea7\u7684\u5965\u6570\u9898\uff1f\u4e94\u5e74\u7ea7\u5965\u6570\u9898
1. 765\u00d7213\u00f727\uff0b765\u00d7327\u00f727
\u89e3\uff1a\u539f\u5f0f=765\u00f727\u00d7(213+327)= 765\u00f727\u00d7540=765\u00d720=15300
2. (9999\uff0b9997\uff0b\u2026\uff0b9001)-(1\uff0b3\uff0b\u2026\uff0b999)
\u89e3\uff1a\u539f\u5f0f=\uff089999-999\uff09+\uff089997-997\uff09+\uff089995-995\uff09+\u2026\u2026+(9001-1)
=9000+9000+\u2026\u2026.+9000 (500\u4e2a9000)
=4500000
3\uff0e19981999\u00d719991998-19981998\u00d719991999
\u89e3\uff1a\uff0819981998+1\uff09\u00d719991998-19981998\u00d719991999
=19981998\u00d719991998-19981998\u00d719991999+19991998
=19991998-19981998
=10000
4\uff0e(873\u00d7477-198)\u00f7(476\u00d7874\uff0b199)
\u89e3\uff1a873\u00d7477-198=476\u00d7874\uff0b199
\u56e0\u6b64\u539f\u5f0f=1
5\uff0e2000\u00d71999-1999\u00d71998\uff0b1998\u00d71997-1997\u00d71996\uff0b\u2026\uff0b2\u00d71
\u89e3\uff1a\u539f\u5f0f\uff1d1999\u00d7\uff082000\uff0d1998\uff09\uff0b1997\u00d7\uff081998\uff0d1996\uff09\uff0b\u2026
\uff0b3\u00d7\uff084\uff0d2\uff09\uff0b2\u00d71
\uff1d\uff081999\uff0b1997\uff0b\u2026\uff0b3\uff0b1\uff09\u00d72\uff1d2000000\u3002
6\uff0e297\uff0b293\uff0b289\uff0b\u2026\uff0b209
\u89e3\uff1a\uff08209+297\uff09*23/2=5819
7\uff0e\u8ba1\u7b97\uff1a
\u89e3\uff1a\u539f\u5f0f=\uff083/2\uff09*\uff084/3\uff09*\uff085/4\uff09*\u2026*(100/99)*(1/2)*(2/3)*(3/4)*\u2026*(98/99)
=50*(1/99)=50/99
8.
\u6574\u6570a\u9664\u4ee5\u6574\u6570b\uff08b\u4e0d\u7b49\u4e8e\u96f6\uff09\uff0c\u9664\u5f97\u7684\u5546\u662f\u6574\u6570\u800c\u6ca1\u6709\u4f59\u6570\uff0c\u6211\u4eec\u5c31\u8bf4\uff0c\u6570a\u80fd\u88ab\u6570b\u6574\u9664\uff0c\u6570a\u53eb\u505a\u6570b\u7684\u500d\u6570\uff0c\u6570b\u53eb\u505a\u6570a\u7684\u56e0\u6570\u3002
3750/6=625625=25x25
甲是25，
乙是25x6=150
6*甲=乙
甲*乙=3750
6*甲*甲=3750
甲*甲=625
甲=25
3750/6=625
625=25x25
甲是25，
乙是25x6=150
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