Tính bằng cách thuận tiện nhất: 382 + 254 + 246 + 118
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![](https://rs.olm.vn/images/avt/0.png?1311)
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=246 x 81 +246 x 18+246x1
=246 x(81+18+1)
=246x100=24600
k nha.thanks
246 x 81 + 246 x 18 + 246
= 246 x ( 81 + 18 + 1 )
= 246 x 100
= 24600
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(254x147-127x92-254\)
\(=254x147-\left(127x2\right)x46-254\)
\(=254x147-254x46-254\)
\(=254x\left(147-46-1\right)\)
\(=254x100=25400\)
![](https://rs.olm.vn/images/avt/0.png?1311)
x= 102 +246+281+398+254+219
= (102 + 398)+( 281+219)+(246+254)
= 500+ 500+500
= 500 . 3
=1500
đúng 100% luôn đó
![](https://rs.olm.vn/images/avt/0.png?1311)
` (254 + 435) + 565 = 254 + ( 435+565)=254+1000=1254.`
`3,27 + 7,45 + 6,73= (3,27+6,73)+7,45= 10+7.45=17,45.`
`5/9 + ( 4/7 + 4/9 )= (5/9+4/9)+4/7=9/9+4/7= 1+4/7=11/7.`
a: =254+1000=1254
b: =3,27+6,73+7,45=10+7,45=17,45
c: =5/9+4/9+4/7=1+4/7=11/7
![](https://rs.olm.vn/images/avt/0.png?1311)
346 x 3005 - 3005 x 246
= 3005 x ( 346 - 246)
= 3005 x 100
= 300 500
346 x 3005 - 3005 x 246
= 3005 x ( 346 - 246)
= 3005 x 100
= 300 500
![](https://rs.olm.vn/images/avt/0.png?1311)
254 x 35 + 254 x 24 - 254 x 18 - 254
= 254 x 35 + 254 x 24 - 254 x 18 - 254 x 1
= 254 x ( 35 + 24 - 18 - 1 )
= 254 x 40
= 10160
382+254+246+118
=(382+118)+(254+246)
=500+500
=1000
(382+118)+(254+246)
=500+500
=1000