Question

Найди суммы удобным способом.(78+85)+35, 120+(80+70), 27+(113+148), (63+57)+75, (220+154)+46, (128+72)+358

Answer 1

(85+35)+78=198
(120+80)+70=270
(27+113)+148=288
(63+57)+75=195
(154+46)+220=420
(128+72)+358=558

Answer 2

(78+85)+35=(85+35)+78=120+78=198
120+(80+70)=120+80+70=200+70=270
27+(113+148)=113+27+148=140+148=288
(63+57)+75=63+57+75=120+75=195
(220+154)+46=154+46+220=200+220=420
(128+72)+358=128+72+358=200+358=558