题目内容
【题目】已知a=5,b=0.4,c=21,式子3a﹣6b+2c的值是 .
【答案】54.6.
【解析】把a=5,b=0.4,c=21代入3a﹣6b+2c计算即可.
解:3a﹣6b+2c,
=3×5﹣6×0.4+2×21,
=15﹣2.4+42,
=12.6+42,
=54.6;
故答案为:54.6.
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题目内容
【题目】已知a=5,b=0.4,c=21,式子3a﹣6b+2c的值是 .
【答案】54.6.
【解析】把a=5,b=0.4,c=21代入3a﹣6b+2c计算即可.
解:3a﹣6b+2c,
=3×5﹣6×0.4+2×21,
=15﹣2.4+42,
=12.6+42,
=54.6;
故答案为:54.6.