Question

Află numărul necunoscut
48-a=4×8
b-25=49:7
c+68=9×9
d:5=9
72-e=8
9×f=63

Answer 1

a) 48-a=4*8⇔48-a=32⇔a=48-32⇔16

b) b-25=49:7⇔b-25=7⇔b=25+7⇔b=32

c) c+68=9*9⇔c+68=81⇔c=81-68⇔c=13

d) d:5=9⇔d=9*5⇔d=45

e) 72-e=8⇔e=72-8⇔e=64

f) 9*f=63⇔f=63:9⇔f=7

Answer 2

$a).48-a=4*8 \\ 48-a=32 \\ -a=32-48 \\ -a=-16 \\ a=16 \\ \\ b).b-25=49:7 \\ b-25=7 \\ b=7+25 \\ b=32$

$c).c+68=9*9 \\ c+68=81 \\ c=81-68 \\ c=13 \\ \\ d).d:5=9 \\ d=9*5 \\ d=45$

$e).72-e=8 \\ -e=8-72 \\ -e=-64 \\ e=64 \\ \\ f).9*f=63 \\ f=63:9 \\ f=7$