键盘分别输入3个学生的成绩,如果低于60分,则F (Fail),如 果高于或等于90 分则显示 G (good),否则显示 P (Pass)。编写8086汇编语言实现每个学生成绩等级

好的，下面是汇编代码实现：

DATA SEGMENT
    GRADE1 DB ?
    GRADE2 DB ?
    GRADE3 DB ?
    MSG1 DB 'GRADE 1: $'
    MSG2 DB 'GRADE 2: $'
    MSG3 DB 'GRADE 3: $'
    MSG4 DB 'GRADE 1: ', 2 DUP (' '), '$'
    MSG5 DB 'GRADE 2: ', 2 DUP (' '), '$'
    MSG6 DB 'GRADE 3: ', 2 DUP (' '), '$'
    MSG7 DB 'FINAL GRADE OF STUDENT 1: $'
    MSG8 DB 'FINAL GRADE OF STUDENT 2: $'
    MSG9 DB 'FINAL GRADE OF STUDENT 3: $'
DATA ENDS

CODE SEGMENT
    ASSUME CS:CODE, DS:DATA
START:
    MOV AX, DATA
    MOV DS, AX

    ; input first student's grades
    LEA DX, MSG1
    MOV AH, 09H
    INT 21H
    MOV AH, 01H
    INT 21H
    SUB AL, 30H
    MOV GRADE1, AL

    LEA DX, MSG2
    MOV AH, 09H
    INT 21H
    MOV AH, 01H
    INT 21H
    SUB AL, 30H
    MOV GRADE2, AL

    LEA DX, MSG3
    MOV AH, 09H
    INT 21H
    MOV AH, 01H
    INT 21H
    SUB AL, 30H
    MOV GRADE3, AL

    ; display first student's grades
    MOV AH, 09H
    LEA DX, MSG4
    MOV DL, GRADE1
    ADD DL, 30H
    MOV MSG4+7, DL
    INT 21H

    MOV AH, 09H
    LEA DX, MSG5
    MOV DL, GRADE2
    ADD DL, 30H
    MOV MSG5+7, DL
    INT 21H

    MOV AH, 09H
    LEA DX, MSG6
    MOV DL, GRADE3
    ADD DL, 30H
    MOV MSG6+7, DL
    INT 21H

    ; calculate first student's final grade
    MOV AL, GRADE1
    ADD AL, GRADE2
    ADD AL, GRADE3
    MOV BL, 3
    DIV BL

    ; display first student's final grade
    MOV AH, 09H
    LEA DX, MSG7
    CMP AL, 90
    JGE GOOD1
    CMP AL, 60
    JL FAIL1
    MOV DL, 'P'
    JMP DISPLAY1

GOOD1:
    MOV DL, 'G'
    JMP DISPLAY1

FAIL1:
    MOV DL, 'F'

DISPLAY1:
    MOV MSG7+26, DL
    INT 21H

    ; input second student's grades
    LEA DX, MSG1
    MOV AH, 09H
    INT 21H
    MOV AH, 01H
    INT 21H
    SUB AL, 30H
    MOV GRADE1, AL

    LEA DX, MSG2
    MOV AH, 09H
    INT 21H
    MOV AH, 01H
    INT 21H
    SUB AL, 30H
    MOV GRADE2, AL

    LEA DX, MSG3
    MOV AH, 09H
    INT 21H
    MOV AH, 01H
    INT 21H
    SUB AL, 30H
    MOV GRADE3, AL

    ; display second student's grades
    MOV AH, 09H
    LEA DX, MSG4
    MOV DL, GRADE1
    ADD DL, 30H
    MOV MSG4+7, DL
    INT 21H

    MOV AH, 09H
    LEA DX, MSG5
    MOV DL, GRADE2
    ADD DL, 30H
    MOV MSG5+7, DL
    INT 21H

    MOV AH, 09H
    LEA DX, MSG6
    MOV DL, GRADE3
    ADD DL, 30H
    MOV MSG6+7, DL
    INT 21H

    ; calculate second student's final grade
    MOV AL, GRADE1
    ADD AL, GRADE2
    ADD AL, GRADE3
    MOV BL, 3
    DIV BL

    ; display second student's final grade
    MOV AH, 09H
    LEA DX, MSG8
    CMP AL, 90
    JGE GOOD2
    CMP AL, 60
    JL FAIL2
    MOV DL, 'P'
    JMP DISPLAY2

GOOD2:
    MOV DL, 'G'
    JMP DISPLAY2

FAIL2:
    MOV DL, 'F'

DISPLAY2:
    MOV MSG8+26, DL
    INT 21H

    ; input third student's grades
    LEA DX, MSG1
    MOV AH, 09H
    INT 21H
    MOV AH, 01H
    INT 21H
    SUB AL, 30H
    MOV GRADE1, AL

    LEA DX, MSG2
    MOV AH, 09H
    INT 21H
    MOV AH, 01H
    INT 21H
    SUB AL, 30H
    MOV GRADE2, AL

    LEA DX, MSG3
    MOV AH, 09H
    INT 21H
    MOV AH, 01H
    INT 21H
    SUB AL, 30H
    MOV GRADE3, AL

    ; display third student's grades
    MOV AH, 09H
    LEA DX, MSG4
    MOV DL, GRADE1
    ADD DL, 30H
    MOV MSG4+7, DL
    INT 21H

    MOV AH, 09H
    LEA DX, MSG5
    MOV DL, GRADE2
    ADD DL, 30H
    MOV MSG5+7, DL
    INT 21H

    MOV AH, 09H
    LEA DX, MSG6
    MOV DL, GRADE3
    ADD DL, 30H
    MOV MSG6+7, DL
    INT 21H

    ; calculate third student's final grade
    MOV AL, GRADE1
    ADD AL, GRADE2
    ADD AL, GRADE3
    MOV BL, 3
    DIV BL

    ; display third student's final grade
    MOV AH, 09H
    LEA DX, MSG9
    CMP AL, 90
    JGE GOOD3
    CMP AL, 60
    JL FAIL3
    MOV DL, 'P'
    JMP DISPLAY3

GOOD3:
    MOV DL, 'G'
    JMP DISPLAY3

FAIL3:
    MOV DL, 'F'

DISPLAY3:
    MOV MSG9+26, DL
    INT 21H

    MOV AH, 4CH
    INT 21H
CODE ENDS

END START

这段代码会要求用户分别输入三个学生的成绩，并将它们存储在内存中。接着，它会计算每个学生的平均成绩，并根据平均成绩的大小来显示每个学生的成绩等级（G、P或F）。