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64÷8+9×(400-396)÷6-2 = 28×7+9÷9×8-20×5÷10= 4×7-8÷4÷2+4×(7×4-8÷8)=

Răspuns :

Prima este: 12 Al doilea este: 194 Si la al treilea este: 109
64:8+9×(400-396):6-2
=8+9×4:6-2
=8+36:6-2
=8+6-2
=14-2
=12

28×7+9:9×8-20×5:10
=196+1×8-100:10
=196+8-10
=204-10
=194

4×7-8:4:2+4×(7×4-8:8)
=28-2:2+4×(28-1)
=28-1+4×27
=28-1+108
=27+108
= 135