Question

tinh gia tri cua bieu thuc

b = 1+2-3-4+5+6-7-8 ....-303 -304 +305 +305

b = ......

Answer 1

b = ( 1+2-3-4) + ( 5+6-7-8) + .............. + (301+302-303-304) + (305 +305)

b = -4 + (-4) + ..................+ (-4) + 610

b= -4 x  76 + 610

b= -304 + 610

b= 306