( - 2 + 3b ) - ( 2b - 2 ) + 5
= - 2 + 3b - 2b + 2 + 5
= 3b - 2b + 5
= 1b + 5
- ( - 3c + 1 ) + 5c - 7 - 8c
= 3c - 1 + 5c - 7 - 8c
= 3c - 1 + 5c - 8c - 7
= 3c - 1 + ( - 3c ) - 7
= - 1 + ( - 7 )
= - 8
thuc hien phep tru
(a-1)+(a-3)
(2+b)- (b+1) voi a,b thuoc z
Thu gọn biểu thức:
a) 2.( a-3b+5b) + (-3a-7c+5c) -4b b)7.(-a-2b+c)+3.(-2c-6b+a)
c)2.(-3c-6b+7b)-4.(2a-3b+8c) d) -3.(2a+3b-4c)+7.(-2c+8a-2c)+20a+2a+24b
e)-(5a-6b+c)+3.(-2c-6b+a)
thuc hien phep tinh
\(\frac{6}{7}+\frac{1}{7}.\frac{2}{7}+\frac{1}{7}.\frac{5}{7}\)
thuc hien cac phep tinh
1-2-3+4+5-6-7+...+2001-2002-2003+2004
Thuc hien phep tinh :
-4/7 . 2/5 + 6/7 . -3/10
Help me !!!! Thanks
Thuc hien phep tinh ) B = 1 - 3 + 5 - 7 + 9 - 11 + ... + 2017 -2019
Cai nay de lam, giup bn mk nhe
Thuc hien phep tinh : 5^7:5^4+(-2).21 - |-46|
Thuc hien phep tinh :
a) 4 phan 5 + -7 phan 15 . 1, 25
b) 2 phan 5 + 3 phan 5 . ( 4 1phan2 - 3,25)
thuc hien phep tinh
( 5*4^15*9-4*3^20*8^9) /( 5*2^9*6^19-7*2^29*27^6)