Đáp án:

28.76+23.28−28.1328.76+23.28-28.13

=28.(76+23−13)=28.(76+23-13)

=28.86=28.86

=2408=2408

80−(4.52−3.23)80-(4.52-3.23)

=80−(4.25−3.8)=80-(4.25-3.8)

=80−76=80-76

=4=4

5871:{928−[(−82)+247].5}5871:{928-[(-82)+247].5}

=5871:{928−165.5}=5871:{928-165.5}

=5871:{928−825}=5871:{928-825}

=5871:103=5871:103

=57=57

C=35+38+41+....+92+95�=35+38+41+....+92+95

C=[(95−35):3+1].(95+35):2�=[(95-35):3+1].(95+35):2

C=[60:3+1].130:2�=[60:3+1].130:2

C=[20+1].130:2�=[20+1].130:2

C=21.130:2�=21.130:2

C=2730:2�=2730:2

C=1365