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a: =1250:25=50
b: =234(45+55)+234=23400+234=23634
c: =1000x1000=1000000
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`234 xx 1257 - 234 xx 257`
`= 234 xx (1257 -257)`
`= 234 xx 1000`
`= 234000`
`312 xx 415 + 312 xx 574 + 312`
`=312 xx 415 + 312 xx 574 + 312xx1`
`=312 xx(415 + 574+1)`
`= 312 xx 1000`
`= 312000`
234×1257−234×257234×1257-234×257
=234×(1257−257)=234×(1257-257)
=234×1000=234×1000
=234000=234000
312×415+312×574+312312×415+312×574+312
=312×415+312×574+312×1=312×415+312×574+312×1
=312×(415+574+1)=312×(415+574+1)
=312×1000=312×1000
=312000
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234 x 24 - 234 x 14 + 234
= 234 x 24 - 234 x 14 + 234 x 1
= 234 x (24 - 14 + 1)
= 234 x 11
= 2574
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243 x 25 x 3 x 4
= ( 243 x 3 ) x ( 25 x 4 )
= 729 x 100
= 72900
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a) 234 + 177 + 16 + 23 = (234 + 16) + (177 + 23) = 250 + 200 = 450
b) 1 + 2 + 3 + 97 + 98 + 99 = (1 + 99) + (2 + 98) + (3 + 97) = 100 + 100 + 100 = 300
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a) \(\left(81+19\right)+35=135\)
b) \(\left(78+22\right)+\left(65+135\right)=100+200=300\)
c) \(\left(234+17716\right)+23=17950+23=17973\)
d) \(\left(99+1\right)+85=100+85=185\)
234 * 45 + 75 * 234 - 234 * 20
= 234 * (45 +75 - 20)
= 234 * 100
= 23400
234x45+74x234-234x20
=234x(45+75-20)
=234x100
=24300
Hok tốt!
@Kaito Kid