已知﹣x+3y=5,求5(x-3y)²-8(x-3y)-5的值.急拜托拜托

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/30 20:14:29
已知﹣x+3y=5,求5(x-3y)²-8(x-3y)-5的值.急拜托拜托

已知﹣x+3y=5,求5(x-3y)²-8(x-3y)-5的值.急拜托拜托
已知﹣x+3y=5,求5(x-3y)²-8(x-3y)-5的值.急拜托拜托

已知﹣x+3y=5,求5(x-3y)²-8(x-3y)-5的值.急拜托拜托
﹣x+3y=5
x-3y=-5
5(x-3y)²-8(x-3y)-5
=5x(-5)²-8x(-5)-5
=125+40-5
=160

﹣x+3y=5 x-3y=-5
5(x-3y)²-8(x-3y)-5=5x(-5)^2-8x(-5)-5=160