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a) 237 . ( -26 ) + 26 . 137
= ( - 237 ) . 26 + 26 . 137
= 26 . [ ( -237 ) + 137 ]
= 26 . ( -100 )
= -2600
b) 63 . ( -25 ) + 25 . ( -23 )
= ( -63 ) . 25 + 25 . ( -23 )
= 25 . [ ( -63 ) + ( -23 ) ]
= 25 . ( -86 )
= -2150
![](https://rs.olm.vn/images/avt/0.png?1311)
63.(-25)+25.(-23)
=(-63).25+25.(-23)
=25.[(-63)+(-23)]
=25.(-86)
=-2150
63 . (-25) = (-63) . 25
=> 25 . ( -63 + 23 )
= 25 . -40
= -1000
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a) (37 - 17) . (-5) + 23 . (-13 - 17)
= 20 . (-5) + 23 . (-30)
= (-100) + (-690)
= -790
b) 63 . ( - 25 ) + 25 . (-23)
= (-63) . 25 + 25 . (-23)
= 25[(-63) + (-23)]
= 25 . (-86)
= -2150
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 237.(-26) + 26.137
= -237.26 + 26.137
= 26.(-237 + 137)
= 26.(-100)
= -2600
b) 63.(-25) + 25.(-23)
= -63.25 + 25.(-23)
= 25.(-63 - 23)
= 25.(-86)
= -2150
a) 237 . (-26) + 26 . 137 = -237 . 26 + 26 . 137 = 26 . (-237 + 137)
= 26 . (-100) = -2600.
b) Cách 1: 63 . (-25) + 25 . (-23) = -63 . 25 + 25 . (-23) = 25 . (-63 - 23)
= 25 . (-86) = -2150.
Cách 2: 63 . (-25) + 25 . (-23) = -1575 - 575 = -2150.
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\text{(-4).(+125).(-25).(-6).(-8)}\)
\(=\left[\left(-4\right).\left(-25\right)\right].\left[125.\left(-8\right)\right].\left(-6\right)\)
\(=100.\left(-1000\right).\left(-6\right)\)
\(=-100000.\left(-6\right)=600000\)
\(\text{(-98).(1-246)-246.98}\)
\(=98.\left(245-246\right)\)
\(=98.\left(-1\right)\)
\(=-98\)
\(\text{63.(-25)+25.(-23)}\)
\(=25.\left[\left(-63\right)+\left(-23\right)\right]\)
\(=25.\left(-86\right)\)
\(=-2150\)
chúc bạn học tốt
63 . (–25) + 25 . (–23)
= – 63 . 25 + 25 . (–23)
= 25. [–63 + (–23)]
= 25. (–86) = – (25.86) = –2150