1) -39 +14+26+39
= 39-39 + 40
=40
2) -54 +16 +(-6)+54
=54-54 +10
=10
3) 45 +23+(-35)+(-23)
= 45-35 +23 -23
=10+0
=10
4) 45 .17 - 5.9.7
=45.17 -45.7
=45.( 17-7)
=45 .10
=450
5) 24 ( 16-5) -16(24-5)
=24.16 -24.5 -16 .24 +16 .5
= 24.16 -16.24 +5 (16-24)
=0 +5 .(-8)
=-40
Chúc hok tốt!
1. ( - 39 ) + 14 + 26 + 39
= [ ( - 39 ) + 39 ] + ( 14 + 26 )
= 0 + 40
= 40
2. ( - 54 ) + 16 + ( - 6 ) + 54
= [ ( - 54 ) + 54 ] + [ 16 + ( - 6 ) ]
= 0 + 10
= 10
3. 45 + 23 + ( - 35 ) + ( - 23 )
= [ 45 + ( - 35 ) ] + [ 23 + ( - 23 ) ]
= 10 + 0
= 10
4. 45 . 17 - 5 . 9 . 7
= 45 . 17 - 45 . 7
= 45 . ( 17 - 7 )
= 45 . 10
= 450
5. 24 . ( 16 - 5 ) - 16 . ( 24 - 5 )
= 24 . 11 - 16. 19
= 264 - 304
= 264 + ( - 304 )
= - ( 304 - 364 )
= - 40
Chúc bạn học tốt !
1. (-39)+14+26+39
\(=\left[\left(-39\right)+39\right]+\left(14+26\right)\)
\(=0+40\)
\(=40\)
2. (-54)+16+(-6)+54
\(=\left[\left(-54\right)+54+\left[16+\left(-6\right)\right]\right]\)
\(=0+10\)
\(=10\)
3. 45+23+(-35)+(-23)
\(=\left(45+\left(-35\right)\right)+\left(23+\left(-23\right)\right)\)
\(=10+0\)
\(=10\)
4. 45.17-5.9.7
\(=45.17-45.7\)
\(=45.\left(17-7\right)\)
\(=45.10\)
\(=450\)
5. 24.(16-5)-16.(24-5)
\(=24.16-24.5-16.24+16.5\)
\(=24.\left(16-16\right)+5.\left(-24+16\right)\)
\(=24.0+5.\left(-8\right)\)
\(=0+\left(-40\right)\)
\(=-40\)
1. (-39)+14+26+39
=(-39+39)+(14+26)
=0+40
=40
2. (-54)+16+(-6)+54
=(-54+54)+[16+(-6)]
=0+10
=10
3. 45+23+(-35)+(-23)
=[45+(-35)]+[23+(-23)]
=10+0
=10
4. 45.17-5.9.7
=45.17-45.7
=45.(17-7)
=45.10
=450
5. 24.(16-5)-16.(24-5)
=24.11-16.19
=264-304
=40
