Câu 1. Tính
A. -1/3 + 2/5 – 5/2
B. 1/5 : 1/10 – 1/3 ( 6/5 – 9/4 )
C. 1/5 × 4/7 + 1/5 × 3/7 – 3/5
D. 17/5 × -31/125 × 1/2 × 10/17 × -1/2^3
Câu 2 . Tìm x
A. 2/5 – X = -3/4
B. 1/2 × ( 2X – 2/5 ) = -3/5
C. 3 – / X + 1/2 / = 5/4
Câu 1. Tính
A. -1/3 + 2/5 – 5/2
B. 1/5 : 1/10 – 1/3 ( 6/5 – 9/4 )
C. 1/5 × 4/7 + 1/5 × 3/7 – 3/5
D. 17/5 × -31/125 × 1/2 × 10/17 × -1/2^3
Câu 2 . Tìm x
A. 2/5 – X = -3/4
B. 1/2 × ( 2X – 2/5 ) = -3/5
C. 3 – / X + 1/2 / = 5/4
Câu C bài 2 nèk
Cho xin ít điểm nha ♥️♥️
Câu 1:
A= -1/3 + 2/5 – 5/2 = 1/15 – 5/2 =-73/30
B = 1/5 :1/10 – 1/3.( 6/5 – 9/4 ) = 2 + 7/20 =47/20
C= 1/5 . 4/7 + 1/5 .3/7 – 3/5 = 1/5 – 3/5 = -2/5
D= 17/5 . -31/125 . 1/2 . 10/17 . -1/2^3 = 17/10 . 31/1000 . 10/17 = 31/1000
CÂU 2 :
A . X = 2/5+ 3/4 =23/20
B. 2X – 2/5 = -3/5 : 1/2 = -6/5
⇒2X = -6/5 + 2/5 = -4/5
⇒X= -4/5 : 2 = -2/5
C. KO HIỂU