Matematică
Catrin
2018-01-23 07:43:57
2x + 15 =23 156-3x=18 7x+21=63
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AlexT56
2018-01-23 13:30:57

2x+15=23 2x=23-15 2x=8 2x=8 X=8:2=4 156-3x=18 3x=156-18 3x=138 x=138:3=46 7x+21=63 7x=63-21 7x=42 x=42:7=6

Mirella22
2018-01-23 13:32:12

2x + 15=23 => 2x=23-15 =8 => x=8:2 =4 156-3x=18 =>3x=156-18 =138 => 3x=138 => x=138:3 , x=46 7x+21=63 => 7x=63-21, 7x=42 => x=42:7=6

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