怎样输入=a1+b1 =a2+b2 ::::=a15+b15

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怎样输入=a1+b1 =a2+b2 ::::=a15+b15
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怎样输入=a1+b1 =a2+b2 ::::=a15+b15
怎样输入=a1+b1 =a2+b2 ::::=a15+b15

怎样输入=a1+b1 =a2+b2 ::::=a15+b15
=sumproduct(a1:a14,b1:b14)