a=-29/37,b=-45/37,则a的3次方- 6ab+b的3次方 等于多少

来源:学生作业帮助网 编辑:作业帮 时间:2024/12/02 07:03:10
a=-29/37,b=-45/37,则a的3次方- 6ab+b的3次方 等于多少
x)K576I511vL|>ٚϦU0KLNB(<_dW%nhTOv6qv @XYgÓKV#QMZ; Bk+Ji'iB-uAAHJtCt ɣ 7! t5tP,l @ o"

a=-29/37,b=-45/37,则a的3次方- 6ab+b的3次方 等于多少
a=-29/37,b=-45/37,则a的3次方- 6ab+b的3次方 等于多少

a=-29/37,b=-45/37,则a的3次方- 6ab+b的3次方 等于多少
a+b=-29/37-45/37=-2
所以原式=(a³+b³)-6ab
=(a+b)(a²-ab+b²)-6ab
=-2(a²-ab+b²)-6ab
=-2a²+2ab-2b²-6ab
=-2a²-4ab-2b²
=-2(a²+2ab+b²)
=-2(a+b)²
=-2×(-2)²
=-8