数学巧算四道题,求帮解:1.125x88+404x25=?2.320x44+68x440=?3.79x79-79+22x79=?4.25x57+25x42+25=?

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数学巧算四道题,求帮解:1.125x88+404x25=?2.320x44+68x440=?3.79x79-79+22x79=?4.25x57+25x42+25=?数学巧算四道题,求帮解:1.125x

数学巧算四道题,求帮解:1.125x88+404x25=?2.320x44+68x440=?3.79x79-79+22x79=?4.25x57+25x42+25=?
数学巧算四道题,求帮解:
1.125x88+404x25=?
2.320x44+68x440=?
3.79x79-79+22x79=?
4.25x57+25x42+25=?

数学巧算四道题,求帮解:1.125x88+404x25=?2.320x44+68x440=?3.79x79-79+22x79=?4.25x57+25x42+25=?
1. 125x88+404x25
=125x8x11+101x4x25
=11000+10100
=21100
2. 320x44+68x440
=44x(320+680)
=44x1000
=44000
3.79x79-79+22x79
=79x(79-1+22)
=79x100=7900
4.25x57+25x42+25
=25x(57+42+1)
=25x100=2500

34+34x99=34x1+34x99=34x(1+99)=34x100=3400
35x35+35x64+35=35x35+35x36+35x1=35x(36+35+1)=35x72=2520
173x73-73x73=73x(173-73)=73x100=7300
98x37=37x(100-2)=3700-74=3626
99x49+49=49x(99+1)=49x100=4900
125x9-125=125x(9-1)=125x8=1000

1.125*80+125*8+400*25+4*25=21100
2.44*(320+68*10)=44000
3.79*(79-1+22)=7900
4.25*(57+42+1)=2500

1,原式=125×8×11+4×101×25=1000×11+100×101=11000+10100=21100
2,原式=32×440+68×440=(32+68)×440=44000
3,原式=79×﹙79-1+22﹚=79×100=7900
4,原式=25×﹙57+42+1﹚=25×100=2500

  1.  125*8*11+(400+4)*25=11000+10000+100=21100

  2. 32*440+68*440=(32+68)*440=44000

  3. 79*(79-1+22)=79*100=7900

  4. 25*(57+42+1)=25*100=2500

1, 125x8+125x80+101x4x25=1000+100+10100=11200
2, 44x(320+680)=44000
3, 79x(79-1+22)=7900
4, 25x(57+42+1)=2500

  1. 125*8*11+25*4*101=1000*11+100*101=11000+10100=21100

  2. 44*(320+680)=44*1000=44000

  3. 79*(79-1+22)=79*100=7900

  4. 25*(57+42+1)=25*100=2500