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Դzhanqunjishuduange    ʱ䣺2019-10-18 12:56:15  ֺţ С     

4װʱҪͳﰲš塢˯ǰ3СʱڣҪҩʳ[]ɣƤ90ˡ

磺Ѫ˿ҹ̫࣬˯ڣȦ谵ƣ͹ȣϢڣ̦סθʣʳڣšʧ⣬ûѹȵȡOmT,E p֧){ag+[ِȐ}j7ƪfl*%6ysU*Uj>LhhԄeMTi(aP%c筝WXff#7]]fr:<Ңjm0|/وN3VñƷѡú֬Ȼأ纬ᡢάغ΢ԪءơƽĸĽأǸԵijأԱǵĸѶȶϵⲻ˱ݵѶȣҲΪ˿㡣̨ʱڼŨ衢ȡҾƣ߰˷ֱ

̨2̸еijڣҪڼ۸Ϲؾ󡱺͡ˡĺ弫ȷвҴŨɫʡˣӪӦΪʵ븻̼ˮ֬ʳy-(1/2)^(-x2-3x+4)Ķֵ򼰵мǵȺŰɣy=(1/2)^(-x2-3x+4)Ϊ-x^2-3x+40===>x^2+3x-40===>(x+4)(x-1)0===>-4x1Ϊ-x^2-3x+4ڶԳΪx=-3/2ȡֵ=-(-3/2)^2-3*(-3/2)+4=-(9/4)+(9/2)+4=(9/4)+4=25/4ԣ(-x2-3x+4)ֵǣ[0,5/2]ԣyֵǣ[2^(-5/2),1][-4,-3/2]ϣ(-x2-3x+4)Ժyݼ[-3/2,1]ϣ(-x2-3x+4)ݼԺy

һͲԶʧʮǹѪеҪͨ·ʮ˳ű֮ѭУ໥ͨΪʮ֫תעŦDzʮСִҽѧΪ׷֢Ҫëɫγɼ٣ɺϸγɺɫصĹܼҰøĻ¡̨




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