Question

Tính nhanh:

a.576+678+780-475-577-679

b.376+421-142-134+439

c.200-18:(276:3-168x2:4+1)

Answer 1

a. 303

b. 960

c. 198

Answer 2

a; 576 + 678 + 780 - 475 - 577 - 679

= (780 - 475) - (577 - 576) - (679 - 678) 

=  305 - 1 - 1

= 304 - 1

= 303

Answer 3

b; 376 + 421 - 142 - 134 + 439

= [376 - (142 + 134)] + (421 + 439)

= [376 - 276] + 860

= 100 + 860

= 960