Răspuns :

Crys157724id

35-21+x=30

14+x=30

x=30-14

x=16

87-x-40=40

87-x=40+40

87-x=80

x=87-80

x=7

x-13-15=32

x-13=32+15

x-13=47

x=47+13

x=60

x+50-31=60

x+50=60+31

x+50=91

x=91-50

x=41

Daniel201793id

Explicație pas cu pas:

35-21+x=30

14+x=30

×=30-14

×=16

v:35-21+16=14+16=30

87-×-40=40

47-x=40

x=47-40

x=7

v:87-7-40=80-40=40

x-13-15=32

×-28=32

x=32+28

x=60

v:60-13-15=47-15=32

x+50-31=60

×+19=60

×=60-19

×=41

v:41+50-31=91-31=60

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