Toán Lớp 6: 2 mũ 3.15- 2 mũ 3 .5
71-(-30)-37-81+37
2 mũ 3.15-[105-(15-10)mũ 2]
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Toán Lớp 6: 2 mũ 3.15- 2 mũ 3 .5
71-(-30)-37-81+37
2 mũ 3.15-[105-(15-10)mũ 2]
Comments ( 2 )
2^3 .15-2^3 .5
=2^3 .(15-5)
=8.10
=80
71-(-30)-37-81+37
=71+30-37-81+37
=(71-81)+(-37+37)+30
=-10+30
=20
2^3 .15-[105-(15-10)^2]
=8.15-[105-5^2]
=120-[105-25]
=120-80
=40
Giải đáp:
1. 80
2. 20
3. 40
Lời giải và giải thích chi tiết:
1.
2³ . 15 – 2³ . 5
= 2³ . ( 15 – 5 )
= 2³ . 10
= 8 . 10
= 80
2.
71 – ( -30 ) – 37 – 81 + 37
= 71 + 30 – 37 – 81 + 37
= ( 71 – 81 ) + ( 37 – 37 ) + 30
= ( -10 ) + 0 + 30
= ( -10 ) + 30
= 20
3.
2³ . 15 – [ 105 – ( 15 – 10 )² ]
= 8 . 15 – [ 105 – 5² ]
= 8 . 15 – [ 105 – 25 ]
= 8 . 15 – 80
= 120 – 80
= 40