4)72÷8×7-59=
=9×7-59
=63-59
=4
80-81÷9×5=
=80-9×5
=80-45
=35
35+35÷7×9=
=35+5×9
=35+45
=80
100-42÷6×9-6×5÷10=
=100-63-3
=100-60
=40
25+54÷6÷3×10-49÷7×4=
=25+9÷3×10-7×4
=25+3×10-28
=25+30-28
=25+2
=27
5)
90-(35+7)÷6=
=90-42÷6
=90-7
=83
(39+24)÷7+18=
=63÷7+18
=9+18
=27
3×(64-56)+(72-36)÷4=
=3×8+36÷4
=24+9
=33