A = ( 54 + 65 + 31 ) + ( -72+-28) + 120
A = 150+-100 + 120
A = 50 + 120
A = 170
A = ( 54 + 65 + 31 ) + ( -72+-28) + 120
A = 150+-100 + 120
A = 50 + 120
A = 170
thuc hien phep tinh
125 (28+72 ) - 25 (3^2 .4 +64 )
thuc hien phep tinh :
a) 28/11 . 21/22 . 9
Khong thuc hien phep tinh de tim ket qua. Hay chung minh rang cac tong sau lon hon 1
N = \(\frac{21}{90}+\frac{31}{72}+\frac{21}{40}+\frac{-1}{45}+\frac{-1}{50}\)
Khong thuc hien phep tinh de tim ket qua. Hay chung minh rang tong sau lon hon 1
N = \(\frac{21}{90}+\frac{31}{72}+\frac{21}{40}+\frac{-1}{45}+\frac{-1}{50}\)
Thuc hien phep tinh
A/-120 - 18×(-5+6)
B/465+(-38)+(-465)+10+(-42)
thuc hien phep tinh( hop ly neu co the):
a) (11+159) . 37+(185-31) :14
b) 3280-(3^2.7^3.49)
thuc hien phep tinh
a. 2 nhan 7 mu 2 - 16 nhan 2 mu 3
b. 17 nhan 120 + 17 nhan ( -20 )
1,thuc hien phep tinh hop li
a,187+[923-(923+887)]
B, 39.187+30^2-78.39
giup minh giai nhung thuc hien phe tinh nha
Ban Hoa dem 1 so tu nhien a chia cho 28duoc so du la 27.con dem chia cho 2 thi duoc so du la 28.hay chung minh Hoa thuc hien it nhat 1 phep tinh