Bài 1 Thực hiện phép tính;
a) 1/-4- 4/-3 + 1/-3. (50%-1 3/2) b) -7/5.15/-49- ( 2/5 + 4/3): 13/5
c) 3/4 – 3/2+ 1/2 : 5/12
Bài 1 Thực hiện phép tính;
a) 1/-4- 4/-3 + 1/-3. (50%-1 3/2) b) -7/5.15/-49- ( 2/5 + 4/3): 13/5
c) 3/4 – 3/2+ 1/2 : 5/12
Câu hỏi mới
=-3/12+16/12-4/12.(-4/2)=-3/12+16/12-4/12.(-2)
=-3/12+16/12+8/12=(-3+16+8)/12=21/12=7/4
= (-7/5) * (15/-49) – (6/15 + 20/15) : (1/65)
= (-7/5) * (-15/49) – (26/15) : (1/65)
= 105/245 – (26/15) * (5/13)
= 105/245 – 26/39
= (-105/7) * (3/35)
= -15/49
= 3/4 – 3/2 + (1/2) * (12/5)
= 3/4 – 3/2 + 6/10
= 3/4 – 3/2 + 3/5
= (15/20) – (30/20) + (12/20)
= -3/20