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The calculation result always a 'NaN' – Jquery

let z = document.getElementById('id_z') let x = document.getElementById('id_x') let y = document.getElementById('id_y') $("#id_a, #id_b, #id_c, #id_d, #id_e").keyup(function () { let a = $('#id_a').val() let b = $('#id_b').val() let c = $('#id_c').val() let d = $('#id_d').val() let e = $('#id_e').val() z.value…

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