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12000-(1500.3+1800.3+1800.2:3)
= 12000-(4500+5400+1200)
=12000 - 11100
= 900
12000-(1500.3+1800.3+1800.2:3)
=12000-(4500+5400+1200)
=12000-11100
=900
Chúc bạn học tốt
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/x+1/2/=3/4-5/6
/x+1/2/=-1/12
x =-1/12-1/2
x =-7/12 hoặc x= -5/12
bn làm đúng r nhưng mk bảo nek , đik thì làm ntn bn chỉ đc nửa điểm thôi , bn còn thiêu bươc quy đồng nha bn !! Và bn phải ghi rõ : Ta xet trường hợp , Th1 , TH2
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\(=-48+48\times\left(-78\right)+48\times\left(-21\right)\)
\(=48\times\left(-1-78-21\right)\)
\(=48\times\left(-100\right)\)
\(=-4800\)
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\(S=2-4+6-8+...+2004-2006\)
\(S=\left(2-4\right)+\left(6-8\right)+...+\left(2004-2006\right)\)
\(S=\left(-2\right)+\left(-2\right)+...+\left(-2\right)\)
\(S=1004\times\left(-2\right)\)
\(S=-2008\)
1500:2=775
1884:2=942
1556:2=778
1500 : 2 = 750
1884 : 2 = 942
1556 : 2 = 778
Thanks you