怎么算 2a²+5a+3的值等于8则6a²+15a-10的值为急
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怎么算 2a²+5a+3的值等于8则6a²+15a-10的值为急
怎么算 2a²+5a+3的值等于8则6a²+15a-10的值为
急
怎么算 2a²+5a+3的值等于8则6a²+15a-10的值为急
2a²+5a+3=8
则:2a²+5a=8-3=5
所以:
6a²+15a-10
=3×(2a²+5a)-10
=3×5-10
=15-10
=5