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31+2加2+2等于几
"31+2加2+2等于几"...31+2加2+2等于几
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31^2加4×4等于几
"31^2加4×4等于几"...31^2加4×4等于几
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31-2加31×3等于几
"31-2加31×3等于几"...31-2加31×3等于几
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31-2加31.6等于几
"31-2加31.6等于几"...31-2加31.6等于几