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1: \(=-24\left(45-5\right)=-24\cdot40=-960\)
2: \(=-134\left(1-51+48\right)=-134\cdot\left(-2\right)=268\)
3: \(=124\left(1-52+47\right)=124\cdot\left(-3\right)=-372\)
1, -55 . 78 + ( -13 ) . 78 - 78 . ( -65 )
= 78 . ( -55 - 13 - 65 )
= 78 . ( -133 )
= -10374
Còn lại tự làm
\(1,-55.78+13\cdot\left(-78\right)-78.\left(-65\right)=78\left(-55-13-65\right)=78.\)
124 . 52 + 124 + ( - 124 ) . ( - 47 )
= 124 . 52 + 124 + 124 . 47
= 124 . ( 52 + 1 + 47 )
= 124 . 100
= 12 400
\(124\times52+124+\left(-124\right)\times\left(-47\right)\)
\(=124\times52+124+124\times47\)
\(=124\times\left(52+1+47\right)\)
\(=124\times100\)
\(=12400\)
Code : Breacker
b) \(-55.78+13.\left(-78\right)-78.\left(-65\right)\)
\(=55.\left(-78\right)+13.\left(-78\right)-65.\left(-78\right)\)
\(=\left(-78\right).\left(55-65+13\right)\)
\(=\left(-78\right).3\)
\(=-234\)
\(a,-55.78+13\left(-78\right)-78.\left(-65\right)\)
\(=78\left(-55-13+65\right)\)
\(=78.\left(-3\right)\)
\(=-234\)
\(b,45\left(-24\right)+\left(-10\right).\left(-12\right)\)
\(=-90.\left(-12\right)+\left(-10\right).\left(-12\right)\)
\(=-12\left(-90-10\right)\)
\(=-12.\left(-100\right)\)
\(=1200\)
a) \(-55.78+13.\left(-78\right)-78.\left(-65\right)\)
\(=\left(55+13-65\right).\left(-78\right)\)
\(=-234\)
b) \(45.\left(-24\right)+\left(-10\right).\left(-12\right)\)
\(=45.\left(-24\right)+\left(-10\right):2.2.\left(-12\right)\)
\(=45.\left(-24\right)+\left(-5\right).\left(-24\right)\)
\(=\left(-24\right).\left(45-5\right)\)
\(=-960\)
khó quá đi!!