Python:
```python
for i in range(1, 10):
for j in range(1, i + 1):
print(f"{j}x{i}={i * j}", end="\t")
print()
```
C:
```c
include
int main() {
int i, j;
for (i = 1; i <= 9; i++) {
for (j = 1; j <= i; j++) {
printf("%d*%d=%d\t", j, i, i * j);
}
printf("\n");
}
return 0;
}
```
Java:
```java
public class MultiplicationTable {
public static void main(String[] args) {
for (int i = 1; i <= 9; i++) {
for (int j = 1; j <= i; j++) {
System.out.print(j + "*" + i + "=" + (i * j) + "\t");
}
System.out.println();
}
}
}
```
C++:
```cpp
include
int main() {
for (int i = 1; i <= 9; i++) {
for (int j = 1; j <= i; j++) {
std::cout<< j << "*"<< i << "=" << (i * j) << "\t";
}
std::cout << std::endl;
}
return 0;
}
```
JavaScript:
```javascript
for (let i = 1; i <= 9; i++) {
for (let j = 1; j <= i; j++) {
console.log(j + "*" + i + "=" + (i * j));
}
console.log();
}
```
这些代码示例展示了如何使用不同的编程语言生成九九乘法表。每个示例都使用了嵌套的for循环来控制行和列，并使用适当的格式化输出每个乘法表达式。你可以根据自己的需要选择合适的编程语言和代码风格。