Question

a)×-20=43
b)×+40=51
c)31+×=92
c)31-×=12
d)×:7=9
e)15:×=3
f)7•×=77
g)ו9=99
h)2×-4=8
i)3×+6=18
k)2•(×+5)=30
l)3•(×-2)=21

va rog ,îmi trebuie pana la 18:00
urgent​

Answer 1

Răspuns:

a)63

b)11

c)61

c)19

d)63

e)5

f)11

g)11

h)2•6=12

i)3•4

k)2•(10+5)

l)3•(9-2)

Answer 2

a) x-20=43 => x=43+20 => x=63

b) x+40=51 => x=51-40 => x=11

c) 31+x=92 => x=92-31 => x=61

d) 32-x=12 => x=32-12 => x=20

e)x:7=9 => x=7*9 => x=63

f)15:x=3 => x=15:3 => x=5

g)7*x=77 => x=77:7 => x=11

h)x*9=99 => x=99:9 => x=11

i)2x-4=8 => 2x=4+8 => 2x=12 => x=12:2 => x=6

j)3x+6=18 => 3x=18-6 => 3x=12 => x=12:3 => x=4

k)2*(x+5)=30 => x+5=30:2 => x+5=15 => x=15-5 => x=10

l)3*(x-2)=21 => x-2=21:3 => x-2=7 => x=7+2 => x=9