1/ 35. 18 – 5. 7. 28
= 35.(18-28)
=35.-10
=-350
2/ 45 – 5. (12 + 9)
=5.(9-12-9)
=5.-12
=-60
3/ 24. (16 – 5) – 16. (24 - 5)
= 24.16-24.5-16.24+16.5
=-24.5+16.5
=(-24+16).5
=-8.5
=-40
1, 35(18-28)=35.(-10)=-350
2, 45-30-45=-30
3, 24.16-24.5-16.24+16.5 = 16.5-24.5 = -40
\(\text{ 35 . 18 - 5 . 7 . 28 = 35 . 18 - 35 . 28}\)
\(\text{= 35 . (18 - 28)}\)
\(\text{= 35 . (-10)}\)
\(\text{= -350}\)
\(\text{45 - 5 . (12 + 9) = 45 - 5 . 9 + 5 . 12}\)
\(\text{= 45 - 45 + 60}\)
\(\text{= 60}\)
\(\text{24 . (16 - 5) - 16 . (24 - 5) = 24 . 16 - 24 . 5 - 16 . 24 + 16 . 5}\)
\(\text{= (24 . 16 - 16 . 24) + (16 . 5 - 24 . 5)}\)
\(\text{=0 + 5 . (16 - 24)}\)
\(\text{= 5. (-8)}\)
\(\text{= -40}\)
1/ 35. 18 – 5. 7. 28
= 35 . 18 - ( 5 . 7 ) . 28
= 35 . 18 - 35 . 28
= 35. ( 18 - 28 )
= 35 .( - 10 )
= - 350
2/ 45 – 5. (12 + 9)
= 5 . ( 9 - 12 - 9 )
= 5 . ( - 12 )
= - 60
3/ 24. (16 – 5) – 16. (24 - 5)
= 24 . 16 - 24 . 5 - 16 . 24 + 16 . 5
= - 24 . 5 + 16.5
= ( - 24 + 16 ) . 5
= - 8 . 5
= - 4
\(a,35.18-5.7.28\)
\(=35.18-35.28\)
\(=35.\left(15-28\right)\)
\(=35.\left(-10\right)=-350\)
\(b,45-5.\left(12+9\right)\)
\(=5.9-5.21\)
\(=5.\left(9-21\right)\)
\(=5.-12=-60\)
\(c,24.\left(16-5\right)-16.\left(24-5\right)\)
\(=24.16-24.5-24.16-5.16\)
\(=24.\left(16-5-16\right)-5.16\)
\(=24.5-5.16\)
\(=5.\left(24-16\right)\)
\(=5.8=40\)
