bài 1: a) $\frac{2}{3}$ + x = – $\frac{1}{2}$ b) $\frac{3}{4}$ – $\frac{1}{4}$ : x = 1$\frac{1}{4}$ 12/10/2021 Bởi Autumn bài 1: a) $\frac{2}{3}$ + x = – $\frac{1}{2}$ b) $\frac{3}{4}$ – $\frac{1}{4}$ : x = 1$\frac{1}{4}$
a) 2/3 + x = – 1/2 b) 3/4 – 1/4 : x = 1 + 1/4 ⇒x = -1/2 – 2/3 ⇒ 1/4 : x = 3/4 – 5/4 = -1/2 ⇒x=-7/6 ⇒ x = 1/4 : -1/2 ⇒ x = -1/2 Bình luận
Đáp án: a) 2/3 + x =1/2 x=1/2 – 2/3 x= 7/6 b) 3/4 – 2/4 : x = 1 1/4 2/4 : x = 5/4 + 3/4 2/4 : x = 8/4 x = 8/4 × 2/4 x= 16/16 =1 Bình luận
a) 2/3 + x = – 1/2 b) 3/4 – 1/4 : x = 1 + 1/4
⇒x = -1/2 – 2/3 ⇒ 1/4 : x = 3/4 – 5/4 = -1/2
⇒x=-7/6 ⇒ x = 1/4 : -1/2
⇒ x = -1/2
Đáp án:
a) 2/3 + x =1/2
x=1/2 – 2/3
x= 7/6
b) 3/4 – 2/4 : x = 1 1/4
2/4 : x = 5/4 + 3/4
2/4 : x = 8/4
x = 8/4 × 2/4
x= 16/16 =1