Question

42*2-39,
(42+63):21,
(60-45):15
, 54:18*15+27,
70:24*32-89,
78-91:7*6,
90-90:15*11,
37+65:13*12

Answer 1

42*2-39=84-39=45;
(42+63)÷21=42÷21+63÷21=2+3=5;
(60-45)÷15=60:15-45÷15=4-3=1;
54÷18*15+27=3×15+27=45+27=72;
78-91÷7*6=78-13*6=78-78=0;
90-90÷15*11=90-6*11=90-66=24;
37+65÷13*12=37+5*12=37+60=97.

Answer 2

42*2-39=45
(42+63):21=5
(60-45):15=1
54:18*15+27=72
70:24*32-89= тут неправильно
78-91:7×6=0
90-90:15×11=24
37+65:13×1247