tính nhanh a 2006 × 125+1000 b 126 × 2006-1006

Question

hongocha · Answer

`a) 2006 xx 125 + 1000`

`=( 2000 + 6) xx 125 + 1000`

`= 2000 xx 125 + 6 xx 125 + 1000`

`= 250 000 + ( 4 + 2) xx 125 + 1000`

`= 250 000 + 4 xx 125 + 125 xx2 + 1000`

`= 250 000 + 500 + 250 + 1000`

`= 250 500 + 250 + 1000`

`= 250 750 + 1000`

`= 251 750`

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`b)126 xx 2006-1006`

`= ( 125 + 1) xx 2006 – 1006`

`= 125 xx 2006 + 1 xx 2006 – 1006`

`= 125 xx 2006 + 2006 – 1006`

`= 125 xx ( 2000 + 6) + ( 2006 – 1006)`

`= 125 xx 2000 + 125 xx 6 +1000`

`= 250 000 + 125 xx ( 4 + 2) + 1000`

`= 250 000 + 125 xx 4 + 125 xx 2 +1000`

`= 250 000 + 500 + 250 + 1000`

`= 250 500 + 250 + 1000`

`= 250 750 + 1000`

`=251 750`

thaophuobg · Answer

`a, 2006 xx 125 + 1000`

`= ( 2000 + 6 ) xx 125 + 1000`

`= 2000 xx 125 + 6 xx 125 + 1000`

`= 250000 + 750 + 1000`

`= 250750 + 1000`

`= 251750`

`b, 126 xx 2006 – 1006`

`= ( 125 + 1 ) xx 2006 – 1006`

`= 125 xx 2006 + 1 xx 2006 – 1006`

`= 125 xx ( 2000 + 6 ) + 2006 – 1006`

`= 125 xx 2000 + 125 xx 6 + 1000`

`= 250000 + 750 + 1000`

`= 250750 + 1000`

`= 251750`

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`( 2006 xx 125 + 1000 )/( 126 xx 2006 – 1006 )`

`= ( 2006 xx 125 + 1000 )/( ( 125 + 1 ) xx 2006 – 1006 )`

`= ( 2006 xx 125 + 1000 )/( 125 xx 2006 + 1 xx 2006 – 1006 )`

`= ( 2006 xx 125 + 1000 )/( 125 xx 2006 + 1000 )`

`= 1`

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