1编号:6560题型:单选题测试正确率:100.0%
当x=-1,y=1时,2xy+(3xy2-2xy)+( 4x2y -3xy2)的值为()
2编号:6559题型:单选题测试正确率:75.0%
当x=-1,y=1时,-xy+(3x2y+xy)-(3x2y-5x3y)的值为()
3编号:6558题型:单选题测试正确率:50.0%
当x=-2,y=1时,x2y-(2xy2+x2y)+(2xy2+4x3y)的值为()
4编号:6476题型:单选题测试正确率:77.5%
当x=2,y=-1时,5x2-(3y2+5x2)+(3y2+xy)的值为()
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