Question

a) 111+2x+29=10 la puterea 3

b) 5x+52-31=30 la puterea 2-19

cu verificare vă rog

Answer 1

a) 111+2x+29=10×10×10
111+2x+29=1000
111+2x=1000-29=971
2x=971-111=860
x=860:2=430
111+2×430+29=10^2
111+860+29=10×10×10
1000=1000
b)5x+52-31=30×30-19
5x+52-31=900-19=881
5x+52=881+31=912
5x=912-52=860
x=860:5
x=172
5×172+52-31=30^2-19
860+52-31=900-19
881=881

Answer 2

111+2x+29=10x10x10=1000
111+2x=1000-29=971
2x=971-111=860
x=860":2
x=430

5x+52-31=900-19=881
5x+52=881+31=912
5x=912-52=860
x=860:5
x=172