已知(3x-2)的二次方加y-3的绝对值=0,求5(2x-y)-2(6x-2y+2)+(4x-3y+1/2)的值
因为 (3x-2)的二次方加y-3的绝对值=0
所以
3x-2=0 y-3=0
x=2/3 y=3
5(2x-y)-2(6x-2y+2)+(4x-3y+1/2)
=10x-5y-12x+4y-4+4x-3y+1/2
=2x--4y+1/2
=2*2/3-4*3+1/2
=4/3-12+1/2
=8/6+3/6-72/6
=-61/6化简最后一步加的是二分之九是不是-91/65(2x-y)-2(6x-2y+2)+(4x-3y+9/2)
=10x-5y-12x+4y-4+4x-3y+9/2
=2x--4y+9/2
=2*2/3-4*3+9/2
=4/3-12+9/2
=8/6+27/6-72/6
=-37/6
已知(3x-2)的二次方加y-3的绝对值,求5(2x-y)-2(6x-2y+2)+(4x-3y+1/2)的值
已知(3x-2)的二次方加y-3的绝对值,求5(2x-y)-2(6x-2y+2)+(4x-3y+1/2)的值
数学人气:318 ℃时间:2020-04-21 18:45:55
优质解答
我来回答
类似推荐
猜你喜欢
- 1计划去人民公园的英语作文80字
- 2speak ask tell talk say区别- =
- 3If you add six and three,you (get)nine
- 4My father exercises every day and he is very healthy.(改为同义句)
- 5我们能用肉眼看到的恒星有_______颗.
- 61mol氯化钠中有多少电子?
- 7This evening you need to take _____ (more than usual )care on the roads because it is very icy.
- 8中国海拔最高的淡水湖在哪?叫什么名字?海拔多少米?
- 91.5只鸡,1.5天,下1.5只蛋,问一只鸡12天下多少蛋?
- 10数学七年级下半年的有关同底数幂的乘法,比赛题.