Răspuns :

Daniel201793id

Explicație pas cu pas:

a)x+89=115

×=115-89

×=26

v:26+89=115

b)2×X+23=91

2×X=91-23

2×X=68

x=68:2

×=34

v:2×34+23=68+23=91

c)327-3×X=15+48

327-3×X=63

3xX=327-63

3×X=264

X=264:3

X=88

v:327-3×88=327-264=63

d)15+(×+2)+21=47

15+(x+2)=47-21

15+x+2=26

x+2=26-15

x+2=11

x=11-2

x=9

v:15+(9+2)+21=15+11+21=26+21=46

e)2×X+37=79-14

2×X+37=65

2xX=65-37

2×X=28

X=28:2

X=14

v:2×14+37=28+37=65

f)32+(2×X-5)=63+14

32+(2×X-5)=77

2×X-5=77-32

2×X-5=45

2×X=45+5

2×X=50

X=50:2

X=25

32+(2×25-5)=32+50-5=82-5=77

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