Explicație pas cu pas:
42+(75-6)×3=
=42+69×3
=42+207
=249
(312-82:2)+86×5=
=(312-41)+86×5
=271+430
=701
820-4×(200-56:8)
=820-4×(200-7)
=820-4×193
=820-772
=48
81-120:(5×40:10)
=81-120:(200:10)
=81-120:20
=81-6
=75
(5+5×5)×5-(5+55):3
=25+5×5-60
=25+20-60
=45-60
=-15
900+(84:3×5+760)×7
=900+28×3800×7
=900+106.400×7
=107.300×7
=751.100
Sper că te-am ajutat!