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31x52约等于多少

答案:约等于2400解题:46x52=2392,根据四舍五入的规则,一个数精确到百位看十位上的数,十位是9大于4,要进位,那么这个数约等于2400

=58x(52+50-2)=58x100=5800

看成50*50,两千五

68*504≈70x500=35000294X18≈300x20=6000198X52≈200x50=10000708X31≈700x30=21000

298约等于300312约等于30029x52约等于30x50=1500608-99约等于600-100=500再看看别人怎么说的.

32x31≈30x30=90059x52≈60x50=3000

45x52=45x(50+2)=45x50+45x2=2250+90=2340大约为:45x50=2250望采纳

41十(一23)十(一31)十0=-13(一26)十52十16十(一72)=-30

72=32+n-1n=72-31=4132+33+34+35++72=41x(32+72)/2=41x52=2132

36+68=2x52=4x26=8x13=10436+68=4x(9+17)=4x26=2x52=8x13=104谢谢,请采纳

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