先化简在求值[(ab+ac)²+(ab-ac)²][(b+c)²-(b-c)²]÷4abca=8,b=-1/2,c=1/4

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/27 04:45:51
先化简在求值[(ab+ac)²+(ab-ac)²][(b+c)²-(b-c)²]÷4abca=8,b=-1/2,c=1/4先化简在求值[(ab+ac)²

先化简在求值[(ab+ac)²+(ab-ac)²][(b+c)²-(b-c)²]÷4abca=8,b=-1/2,c=1/4
先化简在求值[(ab+ac)²+(ab-ac)²][(b+c)²-(b-c)²]÷4abc
a=8,b=-1/2,c=1/4

先化简在求值[(ab+ac)²+(ab-ac)²][(b+c)²-(b-c)²]÷4abca=8,b=-1/2,c=1/4
[(ab+ac)²+(ab-ac)²][(b+c)²-(b-c)²]÷4abc
=[(ab)²+2a²bc+(ac)²+(ab)²-2a²bc+(ac)²][b²+2bc+c²-b²+2bc-c²]÷4abc
=2[(ab)²+(ac)²]4bc÷4abc
=2[(ab)²+(ac)²]÷a
=2a[b²+c²]

[(ab+ac)²+(ab-ac)²][(b+c)²-(b-c)²]÷4abc
=4a²bc x 4bc ÷4abc
=4abc
=4x8x(-1/2)x1/4
=-4