-126-(4^2-5)^2+|-870|:29
tính hợp lý ( nếu có thể )
- 126 - ( 4 ^ 2 - 5 ) ^ 2 + 870 : 29
\(=-126+30-11^2=-147+30=-117\)
1.Tính:
a)A=625-(61-17).12 +(27+14):17
b)B=-126-(4^2-5)^2+870:29
a: \(=625-44\cdot12+\dfrac{41}{17}=97+\dfrac{41}{17}=\dfrac{1690}{17}\)
b: \(=-126-11^2+30=-126-121+30=-217\)
Tính:
A= 625-(61-17).12+(27+24):17
B= -126 - (42-52 )+870-29
làm đúng mình tick ạ
\(A=625-\left(61-17\right)\cdot12+\left(27+24\right)\div17\)
\(A=625-44\cdot12+51\div17\)
\(A=625-528+3\)
\(A=100\)
\(B=-126-\left(4^2-5^2\right)+870-29\)
\(B=-126-\left(16-25\right)+870-29\)
\(B=-126-\left(-9\right)+870-29\)
\(B=-117+870-29\)
\(B=753-29\)
\(B=724\)
Chúc bn hok tốt
1) A \(=625-\left(61-17\right).12+\left(27+24\right):17\)
\(\Leftrightarrow A=625-44.12+51:17\)
\(\Leftrightarrow A=625-528+3\)
\(\Leftrightarrow A=100\)
Vậy A = 100
2) B \(=-126-\left(4^2-5^2\right)+870-29\)
\(\Leftrightarrow B=-126-\left(16-25\right)+870-29\)
\(\Leftrightarrow B=-126-16+25+870-29\)
\(\Leftrightarrow B=724\)
Vậy B = 724
a) \(A=625-\left(61-17\right).12+\left(27+24\right):17\)
\(=625-44.12+51:17\)
\(=625-528+3=100\)
b) \(B=-126-\left(4^2-5^2\right)+870-29\)
\(=-126-16+25+870-29\)
\(=724\)
1.Tìm số nguyên x và y sao cho:\(\left(x-3\right).\left(2y+1\right)=7\)
2.Tính:, A=\(-126-\left(4^2-5\right)^2+870:29\)
giúp mình với mình đang cần gấp bạn nào nhanh mình tick
a,\(\left(x-3\right).\left(2y+1\right)=7\)
Vì \(x;y\inℤ=>x-3;2y+1\inℤ\)
\(=>x-3;2y+1\inƯ\left(7\right)\)
Nên ta có bảng sau
x-3 | 1 | 7 | -7 | -1 |
2y+1 | 7 | 1 | -1 | -7 |
x | 4 | 10 | -4 | 2 |
y | 3 | 0 | -1 | -4 |
Vậy ...
b,\(A=-126-\left(4^2-5\right)^2+870:29\)
\(=-126-\left(16-5\right)^2+30\)
\(=-126-11^2+30\)
\(=-247+30=-217\)
Thực hiện phép tính
a) 5.(–8).( –2).(–3) b) 4.(–5)2 + 2.(–5) – 20
c) 27.(15 –12) – 15.(27 –12) d) - 126 – (42 – 5)2 + 870 : 29
a) 5.(-8).(-2).(-3)
=5.[(-8).(-2).(-3)]
=5.(-48)
=-240
b) 4.(–5)2 + 2.(–5) – 20
= 4.(-5)2 + 2.(-5) - (-4)(-5)
= (-5).[4.(-5) + 2 - (-4)]
= (-5).[-20 + 2 + 4]
=(-5).(-14)
=70
c) 27.(15 –12) – 15.(27 –12)
= 27.15 - 27.12 - 15.27 + 15.12
= (27.15 - 15.27) + (15.12 - 27.12)
= 0 + 15.12 - 27.12
= 12(15-27)
= 12.(-12)
= -144
Tính:
a) A=625–(61–17).12+(27+27):17A=625–(61–17).12+(27+27):17
b) B=−126–(42–5)2+870:29
a) A=625–(61–17).12+(27+27):17A=625–(61–17).12+(27+27):17
=625–528+3=100=625–528+3=100
b) B=−126–(42–5)2+870:29B=−126–(42–5)2+870:29
=−126–112+30=−126–112+30
=−126–121+30=−217
\(A=6.25-\left(61-17\right).12+\left(27+24\right):17\)
\(B=\left(-126\right)-\left(4^2-5^2\right)+870:29\)
\(7^2.5-\left(2x+1\right)=630:9\)\(\)
\(\left(12-4x\right)+120:23=17\)
1. (-12)+(-15)+(-31) | 2. 25+37-59 | 3. (-12)+13-(-60)
4. 24:(-2)+(-5) | 5. 32.(-2)+64 | 6. 18.3+(-50):5
7. (-24)+37+163+(-176) | 8. 125+217+(-625)+529 | 9. 29+132+237+868+763
10. (-87)+126+187+74 | 11. 29.87+29.13 | 12. 123.(-29)-23.(-29)
13. 31.(-18)+31.(-81)-31 | 14.(-12).47+(-12).52+(-12) | 15. 24.(16-5)-16.(24-5)
16. 29.(29-3)-19.(29-13) | 17. -452-(-67+75-452) | 18. -(-171+89+223)-(71-111)+223
19. 21.83-3.7.(-17) | 20. 35-{12-[-14+(-2)]} | 21.5+10+15+20+....+1000
22. 3-6+9-12+....+195-198
1.Tìm n thuộc z có 2n-1 chia hết cho n+1
2.Dùng quy tắc dấu ngoặc đểtính hợp lí:
a)C=(-124)+(36+124-99)-(136-1)
b)D={115+[32-(132-5)]}+(-25)+(-25)
c)F=[(123-17)-(123+33)]-{34-[34+(57-50)-7]}
d)G=(870-1.2).(870-2.3).(870-3.4)...(870-99,100)
e)E=(-7)+(-2020)-(-7)+2020
f)A=(5672-97)-5672
g)B=(-2019)-(29-2019)
a)C= (-124)+ (36 + 124 - 99 ) - ( 136 - 1 ) = (-124) +36 +124 -99 - 136 +1
= -198
b) D = { 115+[ 32 - ( 132 -5 )] } +(-25) +(-25)
= {115+[32-132+5]} +(-25) + (-25)
= {115+(-95)} + (-25)+ (-25)
= 20 +(-25) +(-25) = -30
c)F = [(123 - 17 ) - (123 + 33 ) ] - { 34 - [ 34 + ( 57 -50 ) -7 ] }
= [123 -17 -123 -33 ] - {34- [34 + 57-50 -7]}
= -50 - {34-34} = -50 - 34 +34 = -50
d) mik bo nha
e) E = (-7) +( -2020) -(-7) +2020
= [(-7)-(-7)]+[(-2020) +2020]= 0
g)B= (-2019)-( 29 - 2019) = (-2019) - 29 +2019 = -29
co moi cau d mik ko biet lam :v