Question

Afla valoarea lui ,,x'' din fiecare dintre relatiile :
91-9x0=x+4x7
2. x-4x8=85-9x4
3.4x8=9x9-27
4.x-9x3=6x7+21
5.x+7x8=94-6x3
6.6x9+x=6x4+8x8
7.x+6x8=9x9
8.6x8-x=82-7x9.

Answer 1

a)91-9×0=x+4×7⇒91-0=x+28⇒91=x+28⇒91-28=x⇒x=63
b)x-4×8=85-9×4⇒x-32=85-36⇒x-32=49⇒x=49+32⇒x=81
c)4×8=9×9-27⇒32=81-27⇒54-32=22
d)x-9×3=6×7+21=⇒x-27=42+21⇒x-27=63⇒x=63+27⇒x=90
e)x+7×8=94-6×3⇒x+56=94-18⇒x+56=76⇒x=76-56⇒x=20
f)6×9+x=6×4+8×8⇒54+x=24+64⇒54+x=88⇒x=88-54⇒x=34
g)x+6×8=9×9⇒x+48=81⇒x=81-48⇒x=33
h)6×8-x=82-7×9⇒48-x=82-72⇒48-x=10⇒48-10=x⇒38=x⇒x=38
sucees