Tính nhanh 19.64+76.34 35.12+65.13 136.68+16.272 (2+4+6+..+100).(36.333-108.111) 1990.1990-1992.1988 19991999.1998-19981998.1999 (124.237+152:;(870+23

0 bình luận về “Tính nhanh 19.64+76.34 35.12+65.13 136.68+16.272 (2+4+6+..+100).(36.333-108.111) 1990.1990-1992.1988 19991999.1998-19981998.1999 (124.237+152:;(870+23”

1. `1)19.64+76.34`

   `=19.2.32+38.2.34`

   `=38.32+38.68`

   `=38.(32+68)`

   `=38.100`

   `=3800`

   `2)35.12+65.13`

   `=35.12+65.(12+1)`

   `=35.12+65.12+65`

   `=12.(35+65)+65`

   `=12.100+65`

   `=1200+65`

   `=1265`

   `3)136.68+16.272`

   `=136.68+16.2.136`

   `=136.(68+16.2)`

   `=136.(68+32)`

   `=136.100`

   `=13600`

   `4)(2+4+6+…+100).(36.333-108.111)`

   `=(2+4+6+…+100).(36.3.111-108.111)`

   `=(2+4+6+…+100).(108.111-108.111)`

   `=(2+4+6+…+100).0`

   `=0`

   `5)1990.1990-1992.1998`

   `=1990.1990-(1990+2).1998`

   `=1990.1990-1990.1998-2.1998`

   `=1990.(1990-1998)-2.1998`

   `=1990.2-2.1998`

   `=2.(1990-1998)`

   `=2.2`

   `=4`

   `6)19991999.1998-19981998.1999`

   `=1999.10001.1998-1998.10001.1999`

   `=1999.10001.1998-1999.10001.1998`

   `=0`

   `7)(124.237+152):(870+235.122)`

   `=(29388+152):(870+28670)`

   `=29540:29540`

   `=1`

   `8)(1374.57+687.86):(26.13+74.14)`

   `=(687.2.57+687.86):[26.13+74.(13+1)]`

   `=[687.(2.57+86)]:(26.13+74.13+74)`

   `=[687.(114+86)]:[13.(26+74)+74]`

   `=(687.200):(13.100+74)`

   `=137400:(1300+74)`

   `=137400:1374`

   `=100`

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2. Đáp án + Giải thích các bước giải:

   `19.64+76.34`

   `=19.2.32+38.2.34`

   `=38.32+38.68`

   `=38.(32+68)`

   `=38.100`

   `=3800`

   `—`

   `35.12+65.13`

   `=35.12+65.(12+1)`

   `=35.12+65.12+65`

   `=12.(35+65)+65`

   `=12.100+65`

   `=1200+65`

   `=1265`

   `—`

   `136.68+16.272`

   `=136.68+16.2.136`

   `=136.68+32+136`

   `=136.(68+32)`

   `=136.100`

   `=13600`

   `—`

   `(2+4+6+…+100).(36.333-108.111)`

   `=(2+4+6+…+100).(36.3.111-108.111)`

   `=(2+4+6+…+100).(108.111-108.111)`

   `=(2+4+6+…+100).0`

   `=0`

   `—`

   `1990.1990-1992.1988`

   `=1990.1990-(1990+2).1988`

   `=1990.1990-1988.1990-1988.2`

   `=1990.(1990-1988)-1988.2`

   `=1990.2-1988.2`

   `=2.(1990-1988)`

   `=2.2`

   `=4`

   `—`

   `19991999.1998-19981998.1999`

   `=1999.10001.1998-1999.10101.1998`

   `=0`

   `—`

   `(124.237+152):(870+235.122)`

   `=(29388+152):(870+28670)`

   `=29540:29540`

   `=1`

   `—`

   `(1374.57+687.86):(26.13+74.14)`

   `=(1374.57+687.2.43):[26.13+74.(13+1)]`

   `=(1374.57+1374.43):[26.13+74.13+74]`

   `=[1374.(57+43)]:[13.(26+74)+74]`

   `=[1374.100]:[13.100+74]`

   `=137400:1374`

   `=100`

    

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