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20.(17-111)-17.(222+20)
=20.(-94)-17.242
=(-1880)-4114
=-5994
tick nha bạn
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777 – (–111) – (–222) + 20
= 777 + 111 + 222 + 20
= (777 + 111 + 222) + 20
= 1110 + 20 = 1130.
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15.(17-111)-17.(222+15)
=15.17+15.111-17.15-17.222
=15.17+15.11-17.15-17.2.111
=15.17+15.11-17.15-34.111
=[15.17-15.17]+[111.(15-34)]
=0+111.(-19)
=-2109
15 .(17-111)-17.(222+15)
= 15.17 - 15.111 - 17.222 -17.15
= 17.15 - 17.15 - 15.111 - 17.2.111
= 111( -15 - 17.2 )
= 111 . (-49)
= 5439
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ta có : 111..1222..2=111..1 . 10n + 111..1 .2 =111..1 (10n + 2)=111..1 . 3 . 33...34 =333...3 . 33..34 vậy ..
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4,5C=9+99+999+...+99999...99(40 chữ số 9)
4,5C+40=(9+1)+(99+1)+...+(99999999....9+1)
4,5C+40=10+100+1000+...+1000000...00(40 chữ số 0)
4,5C+40=10+102+103+...+1040
4,5C+40=1041-10
C=(1041-10)-40:4,5
=777+111+222+20
=1130
777 - ( - 111 ) - ( - 222 ) + 20
= 777 + 111 + 222 + 20
= 1130