Question

(64+0)-42. (63-58)+49. (36+47)-78. 54-16+(25-18). 81-(43-17)+24. (45+46)-(23+19)

Answer 1

(64+0)-42= 64-42=22
(63-58)+49= 5+49=54
(36+47)-78= 83-78=5
54-16+(25-18)=54-16+7=38+7=45
81-(43-17)+24=81-26+24=81-50=31
(45+46)-(23+19)=91-(23+19)=91-42=49

Всё ;)