4*25*6-2*76*12-3*8
=100*6-152-24
=600-176
=424
vậy GTBT=424
4 . 25 . 6 - 2 . 76 . 12 - 3 . 8
= (4 . 6) . 25 - (2 . 12) . 76 - 3 . 8
= 24 . 25 - 24 . 76 - 24 . 1
= 24 . (25 - 76 - 1)
= 24 . (-52)
= -1248
a). ( - 125 ) . 4 . ( - 25 ) . 8 .( -6 )
B). 76 - ( -3 ) . 12 + ( -116 ) - ( -4 ) . ( -5 )
3*8*76+2*35*12+4*11*6
a. -75+231-25-131
l-45l:9+32.(-1)2003+(-2016)0
(-6).83+37.(-6)+20.6
26.(76-38)-76.(26-38)
b. -63+415-37-115
l-36l:4+52.(-1)2001+(-2015)0
(-12).71+59.(-12)+30.12
34.(84-26)-84.(34-26)
2.tìm x
a. 42:(x+1)-25=-46
(5-x)3+128=120
lx-2l:(-8)=3
b. 12.(x+3)-21=-45
(1-x)3+158=131
56:lx-4l=-8
3.tìm n thuộc Z để 3n+2 chia hết cho n-1
cứ giải từ từ cũng đc
1) 15 - 98 + 91 - 75 + 98 - 91 - 13
2) 5 - ( 4 - 7 + 12 ) + ( 4 - 7 + 12 ) - 10
3) 20 - ( 25 - 98 + 12 ) + ( 25 - 98 - 72 )
4) - ( 17 - 4 + 13 + | -17 | + 13 )
5) | -16 | - ( 5 - 8 + 7) - ( - 5 ) - 8
6) -20 + ( 3 - 16 + 7 ) - ( 3 - 16 + 7 )
7) 32 - ( 5 - 8 + 32 ) + ( 5 - 8 + 6 )
8) -20 - ( 25 - 11 + 8 ) + ( 25 - 8 + 20 )
a) 1-2+3-4+5-6+7-8+9-10+11
b)98+87+76+...+21-12-23-34-...-89
1.tính nhanh
a) 2 x 16 x 50 x 25
b) 35 x 24 + 35 x 76 + 55 x 19 + 55 x 81
c) 6 x 25 x 4 + 4 x 19 x 6 - 2 x 14 x 12
d) 19 x 64 + 76 x 34
e) 864 x 48 - 432 x 96 / 864 x 48 x 432
a 12 – 34 b 23 – 47 c 31 – 23 d 9 – 5 e 4 – 15 25 f 23 13 17 57 g 4 . 9 6 . 12 – 7 h 14 6 19 14 19 i 56 – 8. 27 7 j 8 5 . 2 – 3 6 k 4 . 3 125 . 25 8 l 9 6 . 3 – 4 7 m 45. 18 – 15 – 18. 45 – 15
Tính :
a, 3^8 : 3^6 ; 2^10 : 8^3 ; 12^7 : 6^7 ; 21^5 : 81^3
b, 5^8 : 25^2 ; 4^9 : 64^2 ; 2^25 : 32^4
Thực hiện phép tính
1. (-3).5-(-4).6+(-23)
2. -17 -(-5).6+(12-17)2
3. 15.(-6) + (-6).85- 15.11
4. (-32) - 2.[23.(-3)-(-5 -7).3]
5. 74.(-41)-41.26+(-2)3. [49+(-2)2]
6. -8. (21-13+72)+80. (-21+76-132)
7. [15:(-3)+40:(-8)] -3.(16:8)
8. [-15:(-3)] -3.[2.(-5-9:3)]