Question

tìm x

a ) 82 - x * 5  = 86 - 9

b ) 78 - x + x + x + x = 4 * 7

Answer 1

a)82-x*5=86-9

82-x*5=77

x*5=82-77

x*5=5

x=5/5

x=1

Answer 2

a ) 83 - x X 5 = 86 - 9

83 - x X 5 = 77

x X 5 = 83 - 77

x X 5 = 6

x = 6 : 5

x = 1,2

b ) 78 - x + x + x + x = 4 x 7

78 + x + x = 4 x 7

78 + x + x = 28

2 X x = 28 - 78

2 X x = - 50

x = - 50 : 2

x = - 25

Answer 3

82—x.5=86—9

82—x.5=75

x.5=82—75

x.5=7

x=7:5

x=7/5

78—x+x+x+x=4.7

78—x.4=28

x.4=78—28

x.4=50

x=50:4

x=1,25

Answer 4

SR au viết nhầm phần a )

82 - x X 5 = 86 - 9

82 - x X 5 = 77

x X 5 = 77 - 82

x X 5 = 5

x = 5 : 5

x = 1

Answer 5

nguyen tai nhat the

a) \(82-x\cdot5=86-9\)

\(82-x\cdot5=77\)

\(x\cdot5=82-77\)

\(x\cdot5=5\)

\(\Rightarrow x=1\)

Answer 6

a) \(82-5x=86-9\)

\(\Leftrightarrow82-5x=77\)

\(\Leftrightarrow5x=5\)

\(\Leftrightarrow x=1\)

b) \(78-x+x+x+x=4\cdot7\)

\(\Leftrightarrow78+2x=28\)

\(\Leftrightarrow2x=-50\)

\(\Leftrightarrow x=-25\)

Answer 7

nguyen tai nhat the

\(78-x+x+x+x=4\cdot7\)

\(78+x+x=4\cdot7\)

\(78+x+x=28\)

\(2\times x=28-78\)

\(2\times x=-50\)

\(x=-50\div2\)

\(x=-25\)