mdk-01.02-N3/N3/MainWindow.xaml

<Window x:Class="N3.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:N3"
        mc:Ignorable="d"
        Title="Калькулятор" Height="500" Width="450">

    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>
            <ColumnDefinition></ColumnDefinition>
        </Grid.ColumnDefinitions>

        <Grid.RowDefinitions>
            <RowDefinition Height="2*"></RowDefinition>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>

        <Grid Grid.Column="0" Grid.ColumnSpan="5">
            <StackPanel>
                <TextBlock Name="TBshow" Style="{StaticResource TBusually}"/>
                <TextBlock Name="TBanswer" FontSize="24" Style="{StaticResource TBusually}" Visibility="Collapsed" />
            </StackPanel>

        </Grid>

        <Grid Grid.Row="1" Grid.Column="0">
            <Button Click="OperationClick">√x</Button>
        </Grid>
        <Grid Grid.Row="1" Grid.Column="1" Grid.ColumnSpan="2">
            <Button Click="ActClick">C</Button>
        </Grid>
        <Grid Grid.Row="1" Grid.Column="3">
            <Button Click="OperationClick">%</Button>
        </Grid>
        <Grid Grid.Row="1" Grid.Column="4">
            <Button Click="OperationClick">/</Button>
        </Grid>

        <Grid Grid.Row="2" Grid.Column="0">
            <Button Click="OperationClick">x^2</Button>
        </Grid>
        <Grid Grid.Row="2" Grid.Column="1">
            <Button Click="NumClick">7</Button>
        </Grid>
        <Grid Grid.Row="2" Grid.Column="2">
            <Button Click="NumClick">8</Button>
        </Grid>
        <Grid Grid.Row="2" Grid.Column="3">
            <Button Click="NumClick">9</Button>
        </Grid>
        <Grid Grid.Row="2" Grid.Column="4">
            <Button Click="OperationClick">*</Button>
        </Grid>

        <Grid Grid.Row="3" Grid.Column="0">
            <Button Click="OperationClick">log10(x)</Button>
        </Grid>
        <Grid Grid.Row="3" Grid.Column="1">
            <Button Click="NumClick">4</Button>
        </Grid>
        <Grid Grid.Row="3" Grid.Column="2">
            <Button Click="NumClick">5</Button>
        </Grid>
        <Grid Grid.Row="3" Grid.Column="3">
            <Button Click="NumClick">6</Button>
        </Grid>
        <Grid Grid.Row="3" Grid.Column="4">
            <Button Click="OperationClick">-</Button>
        </Grid>

        <Grid Grid.Row="4" Grid.Column="0">
            <Button Click="OperationClick">sin</Button>
        </Grid>
        <Grid Grid.Row="4" Grid.Column="1">
            <Button Click="NumClick">1</Button>
        </Grid>
        <Grid Grid.Row="4" Grid.Column="2">
            <Button Click="NumClick">2</Button>
        </Grid>
        <Grid Grid.Row="4" Grid.Column="3">
            <Button Click="NumClick">3</Button>
        </Grid>
        <Grid Grid.Row="4" Grid.Column="4">
            <Button Click="OperationClick">+</Button>
        </Grid>

        <Grid Grid.Row="5" Grid.Column="0">
            <Button Click="OperationClick">ctg</Button>
        </Grid>
        <Grid Grid.Row="5" Grid.Column="1" Grid.ColumnSpan="2">
            <Button Click="NumClick">0</Button>
        </Grid>
        <Grid Grid.Row="5" Grid.Column="3">
            <Button Click="ActClick">,</Button>
        </Grid>
        <Grid Grid.Row="5" Grid.Column="4">
            <Button Click="ActClick">=</Button>
        </Grid>

    </Grid>
</Window>