1: Tính:
a ) 1/2 + 3/4 – 5/6
b) 2/3 × 3/7 + 2/3 × 4/7 + 1 1/3
2: tìm x biết
a) 1/2 × x + 3/4 = 5/6
b) 2/3 × x + 3/4 × x = 1 1/2
1: Tính:
a ) 1/2 + 3/4 – 5/6
b) 2/3 × 3/7 + 2/3 × 4/7 + 1 1/3
2: tìm x biết
a) 1/2 × x + 3/4 = 5/6
b) 2/3 × x + 3/4 × x = 1 1/2
bài 1
a) 1/2+3/4-5/6= 6/12+9/12-10/12
= 5/12
b) 2/3×3/7+2/3×4/7 + 11/3= 2/3 x ( 3/7 +4/7 ) +11/3
= 2/3×1+11/3=2/3+11/3 = 13/3
bài 2
a) 1/2 x X + 3/4= 5/6
1/2xX = 5/6+3/4
X = 19/12 : 1/2
X = 19/6
b) 2/3 xX + 3/4 x X = 11/2
X x ( 2/3 + 3/4 ) = 11/2
X x 17/12 = 11/2
X = 11/2 : 17/12
X = 66/17
cho mình câu trả lời hay nhất nhé
mình ngủ quên