Află numărul necunoscut

a) (x+16):8=7
x+16=7×8
x+16=56
x=56-16
x=40

(x+36):9=8
x+36=9×8
x+36=72
x=72-36
x=36

b) x-(26+37):7=45
x-(26+37)=45×7
x-(26+37)=305
x-63=305
x=305+63
x=368

29-(63+x):9=0
29-(63+x)=9×0
29-(63+x)=0
63+x=29-0
63+x=29
x=63-29
x=34

c)(x+9):6=5
x+9=6×5
x+9=30
x=30-9
x=21

(19+x):6=8
19+x=6×8
19+x=48
x=48-19
x=29

Succes!

a) (x +16):8=7
8·7=56
56-16=40
x=40
(x+36):9=8
9·8=72
72-36=36
x=36
b)x-(26+37):7=45
26+37=63
x-63:7=45
63:7=9
x-9=45
x=45+9
x=54
c)(x+9):6=5
6·5=30
30-9=21
x=21
(19+x):6=8
6·8=48
48-19=29
x=29
b)29-(63+x):9=0
29·9=261
261-63=198
x=198