题目内容
51.3-□+19.2=6.72,□=________.
63.78
分析:把□看作未知数x,再根据求方程解的方法计算即可.
解答:把□看作未知数x,
51.3-x+19.2=6.72,
51.3-x+19.2+x=6.72+x,
51.3+19.2=6.72+x,
70.5=6.72+x,
70.5-6.72=6.72+x-6.72,
x=63.78;
故答案为:63.78.
点评:考查了依据等式的性质求未知数解的方法.
分析:把□看作未知数x,再根据求方程解的方法计算即可.
解答:把□看作未知数x,
51.3-x+19.2=6.72,
51.3-x+19.2+x=6.72+x,
51.3+19.2=6.72+x,
70.5=6.72+x,
70.5-6.72=6.72+x-6.72,
x=63.78;
故答案为:63.78.
点评:考查了依据等式的性质求未知数解的方法.
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