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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
\(1,-55.78+13\cdot\left(-78\right)-78.\left(-65\right)=78\left(-55-13-65\right)=78.\)
\(a,-55.78+13\left(-78\right)-78.\left(-65\right)\)
\(=78\left(-55-13+65\right)\)
\(=78.\left(-3\right)\)
\(=-234\)
\(b,45\left(-24\right)+\left(-10\right).\left(-12\right)\)
\(=-90.\left(-12\right)+\left(-10\right).\left(-12\right)\)
\(=-12\left(-90-10\right)\)
\(=-12.\left(-100\right)\)
\(=1200\)
a) \(-55.78+13.\left(-78\right)-78.\left(-65\right)\)
\(=\left(55+13-65\right).\left(-78\right)\)
\(=-234\)
b) \(45.\left(-24\right)+\left(-10\right).\left(-12\right)\)
\(=45.\left(-24\right)+\left(-10\right):2.2.\left(-12\right)\)
\(=45.\left(-24\right)+\left(-5\right).\left(-24\right)\)
\(=\left(-24\right).\left(45-5\right)\)
\(=-960\)
(-12)(-8)(-125)
=(-12).1000
=-12000
51.134-134-134.48
=134(51-1-48)
=134.2
=268
45(-24)+(-10)(-12)
=2.45.(-12)+(-10)(-12)
=(-12)(90-10)
=(-12)80
=-960
1: =20*(-4)+24(-30)
=-80-720=-800
2: =-13*57+13*32+57*13-57*45
=13*32-57*45=-2149
3: =-12*8*125
=-12*1000=-12000
4: =(-134)(1-51+48)
=(-134)*(-2)=268
5: =(-24)(45-5)=40*(-24)=-960
a: \(\left(-134\right)+51\cdot134+\left(-134\right)\cdot48\)
\(=134\left(-1+51-48\right)=134\cdot2=268\)
b: \(124+\left(-52\right)\cdot124+\left(-124\right)\cdot\left(-47\right)\)
\(=124-52\cdot124+124\cdot47\)
\(=124\left(1-52+47\right)=124\cdot\left(-4\right)=-496\)
c: \(-55\cdot78+13\cdot\left(-78\right)-78\cdot\left(-65\right)\)
\(=78\cdot\left(-55\right)-78\cdot13+78\cdot65\)
\(=78\left(-55-13+65\right)=78\cdot\left(-3\right)=-234\)
d: \(45\cdot\left(-24\right)+\left(-10\right)\cdot\left(-12\right)\)
=-1080+120
=-960