Question

помогите плиз)упр. 136,137,138 срочно!!!!!"

Answer 1

136
59+23+57=59+(23+57)=59+80=139
(85+15)+39=100+39=139

137
(17+23)+(22+28)=40+50=90
(34+36)+(91+19)=70+110=180

138
15+70=85
(a+b)+(7+33)=15+40=55

Answer 2

59+23+37=59+(23+37)=59+60=119
85+39+15=(85+15)+39=100+39=139

17+22+23+28=(17+23)+(28+22)=(40+50=90
34+91+19+36=(34+36)+(91+19)=70+110=180

a+70+b=(a+b)+70=15+70=85
7+a+33+b=(7+33)+(a+b)=40+15=55