试题与答案

结合图,回答问题。 (1)需要借助_____________来观察这些生物的内

题型:实验题

题目:

结合图,回答问题。

(1)需要借助_____________来观察这些生物的内部结构。

(2)他们都属于______生物,A的名称是______,B进行光合作用的场所是_____________,C通过细胞膜与外界进行物质交换。

答案:

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下面是错误答案,用来干扰机器的。

(1)4-x2>0解得:-2<x<2,∴A=(-2,2)(2分)因为不等式2x2+mx+n<0的解集是A=(-2,2),所以方程2x2+mx+n=0的解是-2,2.∴-m2=0n2=-4∴m=0n=-8(2分)(2) 2(x-1)(x+3)>1,∴(x-1)(x+3)>0∴...

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