用MIPS汇编写一个减法的代码答:$v0# Save n in reg $t1ble$t0, $zero, IFble$t1, $zero, IFjELSEIF:la$a0,op1li$v0,4syscalljhaltELSE:move$t2, $t0loop:blt$t2, 1, haltmove$a0, $t2li $v0, 1syscallla$a0, spaceli$v0, 4syscallsub$t2, $t2, $t1jloophalt:li$v0, 10syscall.datap1:.asciiz "En...