A = 18/26 + -5/27 + -22/86 + 12/39 + -32/43
A = 9/13 + -5/27 + -11/43 + 4/13 + -32/43
A = -5/27 + ( 9/13 + 4/13 ) + ( -11/43 + -32/43 )
A = -5/27 + 1 + ( -1)
A = -5/27 + 0
A = 0
B = -10/12 + 8/15 + -19/56 + 3/-18 + 28/60
B = -5/6 + 8/15 + -19/56 + -1/6 + 7/15
B = -19/56 + ( -5/6 + -1/6 ) + ( 8/15 + 7/15 )
B = -19/56 + ( -1 ) + 1
B = -19/56 + 0
B = 0
Thông cảm ...Vì không biết sử dụng phân số nên đành viết bằng dấu gạch chéo
A= -5/27 (tớ rút gọn luôn rồi)
B=-19/56 (tớ rút gọn luôn rồi)
A = 18/26 + -5/27 + -22/86 + 12/39 + -32/43
= 9/13 + -5/27 + -11/43 + 4/13 + -32/43
= (9/13 + 4/13) + (-11/43 + -32/43) + -5/27
= 13/13 + -43/43 + -5/27
= (1 + -1) + -5/27 = 0 + -5/17 = -5/27
B = -10/12 + 8/15 + -19/56 + 3/-18 + 28/60
= -5/6 + 8/15 + -19/56 + -1/6 + 7/15
= (-5/6 + -1/6) + (8/15 + 7/15) + -19/56
= -6/6 + 15/15 + -19/56
= (-1 + 1) + -19/56 = 0 + -19/56 = -19/56
A= 18/26+-5/27+-22/86+12/39+-32/43
=9/13+-5/27+-11/43+4/13+-32/43
=(9/13+4/13)+(-11/43+-32/43)+-5/27
=1+(-1)+-5/27
=(-1+1)+-5/27
=0+-5/27
=-5/27
B=-10/12+8/15+-19/56+3/-18+28/60
=-10/12+8/15+-19/56+-3/18+28/60
=-5/6+8/15+-19/56+-1/6+7/15
=(-5/6+-1/6)+(8/15+7/15)+-19/56
=(-1)+1+-19/56
=(-1+1)+-19/56
=0+-19/56
=-19/56
k cho tui vì điểm hỏi đáp đang âm điểm