1个回答
2017-09-15
展开全部
原式=lim(x→4)(1+2x-9)(√x+2)/[(x-4)(√(1+2x)+3)]
=lim(x→4)2(x-4)(√x+2)/[(x-4)(√(1+2x)+3)]
=lim(x→4)2(√x+2)/[(√(1+2x)+3)]
=2×(√4 +2)/[√(1+2×4)+3]
=2×4/(3+3)
=4/3
=lim(x→4)2(x-4)(√x+2)/[(x-4)(√(1+2x)+3)]
=lim(x→4)2(√x+2)/[(√(1+2x)+3)]
=2×(√4 +2)/[√(1+2×4)+3]
=2×4/(3+3)
=4/3
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