TallesWinder

HTML 

<template>
  <lightning-card title="Novo Lead" icon-name="standard:lead">
    <div class="slds-m-around_medium">
      <lightning-input label="Nome" name="name" onchange={handleInputChange} class="slds-m-bottom_x-small">
      </lightning-input>
      <lightning-input label="Sobrenome" name="sobrenome" onchange={handleInputChange} class="slds-required">
      </lightning-input>
      <lightning-input type="text" label="Empresa" name="empresa" onchange={handleInputChange} class="slds-required">

TallesWinder

HTML

<template>
  <div class="app slds-p-around_x-large">
    <h1 class="slds-text-heading_large">Exercício 2</h1>


    <lightning-input type="text" label="Primeiro Nome" name="primeiroNome" onchange={handleInputChange}>
    </lightning-input>

TallesWinder

HTML

<template>
  <lightning-record-edit-form object-api-name="Lead" onsuccess={handleSuccess}>
    <lightning-messages></lightning-messages>
    <div class="slds-m-around_medium">
      <lightning-input-field field-name="FirstName"></lightning-input-field>
      <lightning-input-field field-name="LastName"></lightning-input-field>
      <lightning-input-field field-name="Company"></lightning-input-field>
      <lightning-input-field field-name="Status"></lightning-input-field>

TallesWinder

({
    Somar : function(component, event, helper) {
        var a = component.get("v.n1");
        var b = component.get("v.n2");
        var total = parseInt(a) + parseInt(b);
        component.set("v.total",total);
        component.set("v.Somar",true);
        component.set("v.Subtrair",false);
        component.set("v.Multiplicar",false);
        component.set("v.Dividir",false);

TallesWinder

<aura:component implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global" >

    <aura:attribute name="n1" type="integer" />
    <aura:attribute name="n2" type="integer" />
    <aura:attribute name="total" type="integer" />

    <aura:attribute name="Somar" type="boolean" default="false" />
    <aura:attribute name="Subtrair" type="boolean" default="false" />
    <aura:attribute name="Multiplicar" type="boolean" default="false" />
    <aura:attribute name="Dividir" type="boolean" default="false" />