A) ( x – 1/2 ) x 5/2 + 1/2 = 7/4
B) 12 x ( x – 6 ) = 4 x X
C) 53,5 : 22 x ( x + 1) – 12,5
D) 2 = 1954 x 0,24 x 76 x 19,54/972 x (X – 4)
A) ( x – 1/2 ) x 5/2 + 1/2 = 7/4
B) 12 x ( x – 6 ) = 4 x X
C) 53,5 : 22 x ( x + 1) – 12,5
D) 2 = 1954 x 0,24 x 76 x 19,54/972 x (X – 4)
A) (X-1/2) × 5/2 + 1/2 = 7/4
(X-1/2) × 5/2 = 7/4 -1/2
(X-1/2) × 5/2 = 5/4
(X-1/2) = 5/4÷5/2
X-1/2 = 1/2
X = 1/2+1/2
X = 1
C) 53,5 : 22 × (x + 1) – 12,5
22 × (x + 1) = 53,5 + 12,5
22 × (x + 1) = 66
x + 1 = 66 : 22
x + 1 = 3
x + 1 = 3 – 1
x = 2
Câu b và câu d e kiểm tra lại đề bài xem nha
a) ( x – $\frac{1}{2}$ ) x $\frac{5}{2}$ + $\frac{1}{2}$ = $\frac{7}{4}$
( x – $\frac{1}{2}$ ) x $\frac{5}{2}$ = $\frac{7}{4}$ – $\frac{1}{2}$
( x – $\frac{1}{2}$ ) x $\frac{5}{2}$ = $\frac{7}{4}$ – $\frac{2}{4}$
( x – $\frac{1}{2}$ ) x $\frac{5}{2}$ = $\frac{5}{4}$
x – $\frac{1}{2}$ = $\frac{5}{4}$ : $\frac{5}{2}$
x – $\frac{1}{2}$ = $\frac{5}{4}$ x $\frac{2}{5}$
x – $\frac{1}{2}$ = $\frac{1}{2}$
x = $\frac{1}{2}$ + $\frac{1}{2}$
x = 1
+, Vậy x = 1
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