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1, -55 . 78 + ( -13 ) . 78 - 78 . ( -65 )
= 78 . ( -55 - 13 - 65 )
= 78 . ( -133 )
= -10374
Còn lại tự làm
\(1,-55.78+13\cdot\left(-78\right)-78.\left(-65\right)=78\left(-55-13-65\right)=78.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a.(-256).43+(-256).25-256.32
=(-256).43+(-256).25+(-256).32 =(-256).(43+25+32)
=(-256).100
-25600
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,-55.78+13\left(-78\right)-78.\left(-65\right)\)
\(=78\left(-55-13+65\right)\)
\(=78.\left(-3\right)\)
\(=-234\)
\(b,45\left(-24\right)+\left(-10\right).\left(-12\right)\)
\(=-90.\left(-12\right)+\left(-10\right).\left(-12\right)\)
\(=-12\left(-90-10\right)\)
\(=-12.\left(-100\right)\)
\(=1200\)
a) \(-55.78+13.\left(-78\right)-78.\left(-65\right)\)
\(=\left(55+13-65\right).\left(-78\right)\)
\(=-234\)
b) \(45.\left(-24\right)+\left(-10\right).\left(-12\right)\)
\(=45.\left(-24\right)+\left(-10\right):2.2.\left(-12\right)\)
\(=45.\left(-24\right)+\left(-5\right).\left(-24\right)\)
\(=\left(-24\right).\left(45-5\right)\)
\(=-960\)
![](https://rs.olm.vn/images/avt/0.png?1311)
5555555555 : 5 + 342 - 65 : 78 =1111111452
K NHA MK LÀ NGƯỜI TRẢ LỜI ĐẦU ĐÓ
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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
\(\left(8-65+10\right)-\left(10+78-55\right)\)
\(=8-65+10-10-78+55\)
\(=\left(8-78\right)-\left(65-55\right)+\left(10-10\right)\)
\(=-70-10+0\)
\(=-80\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, $-28\cdot41+100\cdot141+41\cdot(-72)$
$=41\cdot[(-28)+(-72)]+100\cdot141$
$=41\cdot(-100)+(-100)\cdot(-141)$
$=(-100)\cdot[41+(-141)]$
$=(-100)\cdot(-100)$
$=100\cdot100$
$=10000$
b, $35\cdot(65-6)-65\cdot(35+6)$
$=35\cdot65+35\cdot(-6)-65\cdot35-65\cdot6$
$=(35\cdot65-65\cdot35)+[35\cdot(-6)+65\cdot(-6)]$
$=0+(-6)\cdot(35+65)$
$=-6\cdot100$
$=-600$
c, $-48+48\cdot(-78)-21\cdot48$
$=-48\cdot1+(-48)\cdot78+(-48)\cdot21$
$=-48\cdot(1+78+21)$
$=-48\cdot(79+21)$
$=-48\cdot100$
$=-4800$
65*78=8x
5070=8x
x=2335/4
8x : 78 = 65
8x = 65 x 78
8x = 5070
8x = 5070 : 8 = 634
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