19+25+69 =....?
Bài 1: Thực hiện phép tính:
a) 25. 69 + 31. 25 – 150; b) 198 : [130 – (27 – 19 )2] + 20210 ;
c) 520 : (515.15 + 515.10).
a) 25.69+31.25-25.6
= 25.(69+31-6)
= 25.94
= 2350
b) 198:[130-(27-19)2]+20210
= 198:[130-82]+1
= 198:(130-64)+1
= 198:66+1
= 3+1
= 4
c) 520:[515.(15+10)]
= 520:[515.25]
= 520:(515.52)
= 520: 517
= 53
5/19*38/25< x < 69 / 17+ 33/17
a) - 23+150(-9)+1913
b) 2 MŨ2 .5 + ( 49 – 17 MŨ 2 )
c) 25. 69 + 31. 25 – 150; d) 198 : [130 – (27 – 19 ) MŨ 2] + 2021 MŨ 0
tính nhanh
a) 25+38+59-5-19-8
b) 26-12+42-16+89-69
a) 25+38+59-5-19-8
=(25-5)+(38-8)+(59-19)
=20+30+40
=90
b)26-12+42-16+89-69
=(26-16)+(42-12)+(89-69)
=10+30+20
=60
a) 25+38+59-5-19-8 b) 26-12+42-16+89-69
= (25-5)+(38-8)+(59-19) = (26-16)+(42-12)+(89-69)
= 20+30+40 = 10+30+20
= 90 = 60
a) 25+38+59-5-19-8
=(25 - 5 ) + (38-8) +(59-19)
= 20 +30 + 40
= 60+40
=100
b) 26-12+42-16+89-69
= (26-16) + (42-12) + (89-69)
= 20+30+20
=50 +20
=70
Thuc hien phep tinh hop li(neu co the):
1) 69 .113 - 27. 69 + 69 .14 + 31
2) 90 -(22. 25 - 32. 7)
3) 720 - {40.[(120 - 70) :25 + 23]}
4) 2345 - 1000 :[19 - 2(21 - 18)2]
5) (-23) + 13 + (-17) + 57
6) (-123) + |-13| + (-7)
7) - |-33| +(-15)+ 20 - |45 - 40| - 57
a) 25. 69 + 31. 25 – 150;
b) 198 : [130 – (27 – 19 )2] + 20210 ;
c) 520 : (515.15 + 515.10).
d) 27– (15 – 31) – (– 2 + 21+ 5)
e) 47 – (23 + 17) – (– 17 + 47)
f) 34 – [(–12) + 34] – (49 + 12) g) 72 – (15 – 14 + 72) + 52
a: =25x100-150=2500-150=2350
c: \(=520:\left\{515\cdot25\right\}\)
=104/2575
I.Thực hiện phép tính:
A=20 x 69 +19 x 21 +20 x 31 - 19 x 20
B=25% + 0.75 + 8 4|3-4|3(4|3 là phân số)
C=57% + 0.15 x 8 + 43% -0.2
cmr 19^19 + 69^69 chia het cho 44
dấu này . là dấu nhân nha mn
a) 2. x + 69 . 2 = 49 . 4
b) 2 . x - 12 = x = 0
c) 25 . ( x - 74 ) = 25
d) 165 - ( 35 : x + 3 ) . 19 = 13
Mk vừa trả lời câu này rồi mà,sao bị mất vậy?