先化简,后求值:4(m+1)²-(2m+5)(2m-5),其中m=-3.
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先化简,后求值:4(m+1)²-(2m+5)(2m-5),其中m=-3.
先化简,后求值:4(m+1)²-(2m+5)(2m-5),其中m=-3.
先化简,后求值:4(m+1)²-(2m+5)(2m-5),其中m=-3.
4(m+1)²-(2m+5)(2m-5)=4m²+8m+4-4m²+25=8m+29=-24+29=5