5x=7=42题怎么验算?
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5x=7=42题怎么验算?
5x=7=42题怎么验算?
5x=7=42题怎么验算?
应该是5x+7=42吧.
5x+7=42
5x=42-7=35
x=7
验算:把x=7代人左边5x+7=5x7+7=42
结果与右边一致,正确.所以x=5.