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-23.63+23.21-58.23
= 23. (-63) + 23.21 - 58.23
= 23.( -63 + 21-58)
= 23. (-100)
= -2300
-23.63+23.21-58.23=23.-63+23.21-58.23=23(-63+21-58)=23.-100=-2300
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-23.63+23.21-58.23\\ =23.\left(-63\right)+23.21-58.23\\ =23\left(-63+21-58\right)\\ =23.\left(-100\right)=-2300\)
-23 . 63 + 23 . 21 - 58 . 23
= 23 . (-63 + 21 - 58) = 23 . (-100) = -2300
![](https://rs.olm.vn/images/avt/0.png?1311)
a,15+23+(-25)+(-23)=[ (-23)+23] +[(-25)+15] = 0+(-10)= -10
b,-23.63+23.21-58.23=23.(-63)+23.21-58.23=23.(-63+21-58)=23.(-100)=-2300
a)
15 + 23 + ( -25 ) + ( -23 )
= [ 15 + ( -25 ) ] + [ 23 + ( -23 ) ]
= -10 + 0
= -10.
b)
-23.63 + 23.21 - 58.23
= -23 . ( 63 - 21 + 58 )
= -23 . 100
= -2300.
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-23\cdot63+23\cdot21-58\cdot23\)
\(=-23\left(63-21+58\right)\)
\(=-23\cdot100=-2300\)
![](https://rs.olm.vn/images/avt/0.png?1311)
( - 12 ) . ( - 13 ) + 13 . ( - 29 )
= \(12.13+13.\left(-29\right)\)
=\(13.\left[12+\left(-29\right)\right]\)
=\(13.\left(-17\right)\)
=\(-221\)
a) (-12).(-13) + 13.(-29)
= 12.13 + 13.(-29)
= 13.(12 - 29)
= 13 . (-17)
=-221
b) -23.63 + 23.21 - 58.23
= -(23.63 - 23.21 + 58.23)
= -23.(63 - 21 + 58)
= -23.100
=-2300
![](https://rs.olm.vn/images/avt/0.png?1311)
-23.63 + 23.21 - 58.23
= 23.-63 + 23.21 + 23.-58
= 23.(-63+21+-58)
=23.-100
=-2300
![](https://rs.olm.vn/images/avt/0.png?1311)
3/4×13/21-3/21×7/4+15/4×3/21
= 3/21 x 13/4 - 3/21 x 7/4 + 15/4 x 3/21
= 3/21 x ( 13/4 - 7/4 + 15/4 )
= 3/21 x 21/4
= 3/4
3/4 x 13/21 - 3/21 x 7/4 + 15/4 x 3/21
= 3/21 x 13/4 - 3/21 x 7/4 + 15/4 + 3/21
= 3/21 x ( 13/4 - 7/4 + 15/4 )
= 3/21 x 21/4
= 3/4
-23.63+23.21+23.58
=23.(-63)+23.21+23.58
=23.(-63+21+58)
=23.16
=368