1 ). (127+134)-127+134=
=261-127+134 =134+134=268
2) 991x(9x2):9=
=991x18:9=17838:9=1982
3) 1800: (800-500)x200-600=
=1800:300x200-600=6x200-600
=1200-600=600
4) 350+(275-225:5)-(76+44)=
=350+(275-45)-120=
=350+230-120=580-120=460
5) 545+(50-9)x3-(56+48:4)=
=545+41x3-(56+12)=
=545+123-68=668-68=600