3xx-{7x-(4x-3)-2xx}怎么做
1个回答
xx是x^2?
3x²-{7x-(4x-3)-2x²}
=3x²-(7x-4x+3-2x²)
=3x²-3x-3+2x²
=5x²-3x-3
相关问题
有点挑战性!X7X X3X XXX8XX 2X6 XXX2XX 1XX 6XX48X 5X7 3XX7XX XXX XX
求方程组X1+X2+X3+4xX4-3xX5=02xX1+X2+3xX3+5xX4-5xX5=0X1-X2+3xX3-2
九宫数独求解3XXXX65XX XXX28X6XX 4XXX1XX29 XXX3XXX7X XX5X4X3XX X7XX
3x9xxxx64xx43xx518x5xxxx7xxx7xx98xx2x361x28xx5xx4x6xxxx2xx6x
本人有三道数独题:XXXXXX9X2 X3XX4XX6 2X4XX5XX7 XXXX7X1XX X56XXXX73 XX
29x54xxxx _第一题xxxxxxxxxxx39xxx6x6x9xx3x4xx4xx2xx7xx8x1xx5x2x
xxxx64xx84xx1xxx65x76xxxxxxxxxxx6xx194xx3x82x8xxx7xx3xx5x3x4
两个九宫格.急3X8 XXX X4X XX2XXX1XX X7X 2X4 X9X 49XX6XX25XXX XX7 8X
xx4 8xx xxx7xx xx9 x5xx98 2xx 6xxxxx 7xx xxx5xx x1x xx2xx9 x
xx3 x8x 5xxxxx 65x 24xx9x xxx xxx9xx x4x xx7xxx 2xx xxx714 5