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Đầu tiên là bỏ dấu ngoặc:
8-65+10-10-78+55
=(8-78)+(55-65)+(10-10)
=(-70)+(-10)+0
=-80
\(\left(8-65+10\right)-\left(10+78-55\right)\)
\(=8-65+10-10-78+55\)
\(=\left(8-78\right)-\left(65-55\right)+\left(10-10\right)\)
\(=-70-10+0\)
\(=-80\)
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35.13+35.17+65.75-65.45
=35.(13+17)+65.(75-45)
=35.30+65.30
=30.(35+65)
=30.100
=3000
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1, -55 . 78 + ( -13 ) . 78 - 78 . ( -65 )
= 78 . ( -55 - 13 - 65 )
= 78 . ( -133 )
= -10374
Còn lại tự làm
\(1,-55.78+13\cdot\left(-78\right)-78.\left(-65\right)=78\left(-55-13-65\right)=78.\)
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a) 2003 + ( - 21 + 75 + 2003 )
= 2003 + 2057
= 4060
b) 1152 - ( 374 + 1152 ) + ( - 65 + 374 )
= 1152 - 374 - 1152 + (- 65) + 374
= 1152 - 1152 - 374 + 374 + ( - 65 )
= 0 - 0 + ( - 65 )
= (-65)
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=35.82+35.38+65.75+65
=35.(82+38)+65.(75+1)
=35.120+65.76
=4200+4940
=9140
\(5.13.21+7.65.2+65\)
\(=5.21.13+7.2.65+65.1\)
\(=110.13+11.65\)
\(=1430+715\)
\(=2145\)