41.2×8.1+1.1×91/4+53.7×1.9我再说一遍是9又1分之4,用简便算法,OK?这里只有过客3317 看见了.
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41.2×8.1+1.1×91/4+53.7×1.9我再说一遍是9又1分之4,用简便算法,OK?这里只有过客3317 看见了.
41.2×8.1+1.1×91/4+53.7×1.9
我再说一遍是9又1分之4,用简便算法,OK?
这里只有过客3317 看见了.
41.2×8.1+1.1×91/4+53.7×1.9我再说一遍是9又1分之4,用简便算法,OK?这里只有过客3317 看见了.
41.2×8.1+1.1×9 1/4+53.7×1.9
=41.2×8.1+1.1×9.25+53.7×1.9
=41.2×8.1+1.1×9.25+(41.2+12.5)×1.9
=41.2×8.1+41.2×1.9+1.1×9.25+12.5×1.9
=41.2×(8.1+1.9)+(1+0.1)×9.25+12.5×(2-0.1)
=412+9.25+0.925+25-1.25
=412+0.925+25+(9.25-1.25)
=412+8+25+0.925
=445.925
41.2×8.1+1.1×91/4+53.7×1.9
=41.2*8.1+53.7*(10-8.1)+1.1*22.75
=(41.2-53.7)*8.1+537+25.025
=537-12.5*8.1+25.025
=537-101.25+25.025
=460.775
原是=(41.2*8)+4.12+(100-9)/4+53.7*2-53.7*0.1
=329.6+4.12+22.25+107.4-5.37
=458
41.2×8.1+1.1×91/4+53.7×1.9
=41.2*8.1+1.1*(12.5+10.25)+(41.2+12.5)*1.9
=41.2*(8.1+1.9)+(1.1+1.9)*12.5+(1+0.1)*10.25
=412+37.5+10.25+1.025
=460.775
460.775
可以使用简便法
41.2×8.1+1.1×91/4+53.7×1.9
=41.2*8.1+1.1*(12.5+10.25)+(41.2+12.5)*1.9
=41.2*(8.1+1.9)+(1.1+1.9)*12.5+(1+0.1)*10.25
=412+37.5+10.25+1.025
=460.775
41.2×8.1+1.1×91/4+53.7×1.9
=333.72+1.1×22.75+102.03
=333.72+25.025+102.03
=358.745+102.03
=460.775