Question

一道数学题需要巧算 谢谢要具体过程

Answer 1

利用乘法结合律

Answer 2

解如图。

追问

答案错了

追答

Answer 3

可以吗？

Answer 4

先建立java文件如下所示：
RadioButtonFrame.java
import javax.swing.*;
import javax.swing.border.Border;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/**
* Created by IBM on 2017/9/21.
*/
public class RadioButtonFrame extends JFrame{
private JPanel buttonPanel;
private ButtonGroup group;
private JLabel label;
private static final int DEFAULT_SIZE=36;

public static void main(String[]args){
RadioButtonFrame buttonFrame=new RadioButtonFrame();
buttonFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
buttonFrame.setVisible(true);
}

public RadioButtonFrame(){
label=new JLabel("The quick brown fox jumps over the lazy dog.");
label.setFont(new Font("Serif", Font.PLAIN,DEFAULT_SIZE));
add(label,BorderLayout.CENTER);

buttonPanel=new JPanel();
group=new ButtonGroup();

addRadioButton("Small",8);
addRadioButton

Answer 5

看图