作业帮a²+2ab=5,ab+2b²=-2,则a²-4b²=[ ],求括号里的.
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a²+2ab=5,ab+2b²=-2,则a²-4b²=[ ],求括号里的.
a²+2ab=5,ab+2b²=-2,则a²-4b²=[ ],求括号里的.
a²+2ab=5,ab+2b²=-2,则a²-4b²=[ ],求括号里的.
等式2*-2,再用等式1+等式2,就好了!等于9