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\(-1+2-3+4-5+6-.......+98-99+100\)
\(=-1+\left(2-3\right)+\left(4-5\right)+\left(6-7\right)+...+\left(98-99\right)+100\)
\(=-1+\left(-1\right)+\left(-1\right)+...+\left(-1\right)+100\)
\(=\left(-1\right)48+100=-48+100=52\)
-1 + 2 - 3 + 4 -5+6-7+...-99+100
= -1 +(2-3) + (4-5) + (6-7) + ...+ (98-99) + 100
= -1 -1-1-1-...-1+100
= -51 + 100 = 49
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`(6-2 4/5)*3 1/8-1 3/5:1/4`
`=(6-14/5)*25/8-8/5*4`
`=16/5*25/8-32/5`
`=10-32/5=18/5`
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{ [ ( 1 + 2 ) x 3 - 4 ] : 5 + 6 }x7^8
= { [ 3 x 3 - 4 ] : 5 + 6 }
= { [ 9 - 4 ] : 5 + 6 }
= { 5 : 5 + 6 }
= { 1 + 6 }
= 7
KẾT BẠN NHA
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\(a.\frac{8}{7}+\frac{4}{7}\times\left(-\frac{6}{11}\right)-\frac{4}{7}\times\frac{5}{11}\)
\(=\frac{8}{7}+\frac{4}{7}\left(-\frac{6}{11}-\frac{5}{11}\right)\)
\(=\frac{8}{7}+\frac{4}{7}.\left(-1\right)\)
\(=\frac{8}{7}-\frac{4}{7}\)
\(=\frac{4}{7}\)
( 5/6 - 2/3 + 1/4 ) : 5/4
= ( 1/6 + 1/4 ) : 5/4
= 5/12 : 5/4
= 1/3
nhớ k cho mình nha !