1991x1991-1990x1990 34.5x76.5-345x6.42-123x1.45
199x122+1002x61+100x366(362+548x361)÷(362x548-186)...
199x122+1002x61+100x366
(362+548x361)÷(362x548-186) 展开
(362+548x361)÷(362x548-186) 展开
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1991x1991-1990x1990
=1991X1991-1991X1990+1990
=(1991-1990)X1991+1990
=1991+1990
=3981
或运用平方差公式，原式=(1991-1990)X(1991+1990)=3981
34.5x76.5-345x6.42-123x1.45
=345X7.65-345x6.42-123x1.45
=(7.65-6.42)X345-123X1.45
=1.23X345-1.23X145
=1.23X(345-145)
=1.23X200
=246
199x122+1002x61+100x366
=200x122-122+1000x61+122+300x122
=200X122+500X122+300X122
=1000X122
=122000
(362+548x361)÷(362x548-186)
=(362+548X362-548)÷(362X548-186)
=(548X362-186)÷(362X548-186)
=1
=1991X1991-1991X1990+1990
=(1991-1990)X1991+1990
=1991+1990
=3981
或运用平方差公式，原式=(1991-1990)X(1991+1990)=3981
34.5x76.5-345x6.42-123x1.45
=345X7.65-345x6.42-123x1.45
=(7.65-6.42)X345-123X1.45
=1.23X345-1.23X145
=1.23X(345-145)
=1.23X200
=246
199x122+1002x61+100x366
=200x122-122+1000x61+122+300x122
=200X122+500X122+300X122
=1000X122
=122000
(362+548x361)÷(362x548-186)
=(362+548X362-548)÷(362X548-186)
=(548X362-186)÷(362X548-186)
=1
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