Just began to learn the computer, it will only according to the teacher to knock, but the final results, not the addition, subtraction, multiplication, and division operation hope to have a big show,

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HTML attribute values in the outer layer and layer can't use double quotation marks, advice into onclick operator using single quotes in brackets

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The input tag has no end

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Under the right script tags in the body, & lt; Input (plus)/& gt;

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Positive solution on the ground floor, won't make any difference that if the program is running on the second floor, by the third floor and it seems more than a mistake