共六道题怎么简便计算
共六道题怎么简便计算68X31十68X68十68,353十298,165一89一111十135,25X96X125,88X125,560➗35,...
共六道题怎么简便计算68X31十68X68十68,353十298,165一89一111十135,25X96X125,88X125,560➗35,
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68X31十68X68十68
=68×31+68×68+68×1
=(31+68+1)×68
=100×68
=6800
353十298
=(353-2)+(298+2)
=351+300
=651
165一89一111十135
=(165+135)-(89+111)
=300-200
=100
25X96X125
=25×(100-4)×125
=125×100×4-25×4×100
=12500×4-100×100
=50000-10000
=40000
88X125
=(80+8)×125
=80×125+8×125
=10000+1000
=11000
560➗35
=此题发错了┏ (^ω^)=☞
=68×31+68×68+68×1
=(31+68+1)×68
=100×68
=6800
353十298
=(353-2)+(298+2)
=351+300
=651
165一89一111十135
=(165+135)-(89+111)
=300-200
=100
25X96X125
=25×(100-4)×125
=125×100×4-25×4×100
=12500×4-100×100
=50000-10000
=40000
88X125
=(80+8)×125
=80×125+8×125
=10000+1000
=11000
560➗35
=此题发错了┏ (^ω^)=☞
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