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Dogoter
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Rezolvati ecuatile;318-(4x-186)*20=38;;;;7*(2x+5)-47=100;;;;15+2(3x+4)=2x+31

Răspuns :

MerylStreep
a). 318-(4x-186)·20=38
318-80x-3720=38
-80x-3402=38
-80x=38+3402
-80x=3440
x=3440:(-80)=-43
b). 7·(2x+5)-47=100
14x+35-47=100
14x-12=100
14x=100+12
14x=112
x=112:14=8
c). 15+2·(3x+4)=2x+31
15+6x+8=2x+31
6x-2x=31-8-15
4x=8
x=8:4=2

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