Toán tính nhanh a) 81 + 243 + 19 b)25 x 5-2 x 16 x4 25/07/2021 By Ivy tính nhanh a) 81 + 243 + 19 b)25 x 5-2 x 16 x4
$a) 81 + 243 + 19$ $=(81 + 19)+243$ $=100+243$ $=343$ $b)25×5-2×16 ×4$ $=(25×4)+25-(8×10)-(8×5)-8$ $=100+25-80-40-8$ $=5-8$ $=-3$ Trả lời
a)81+243+19 =(81+19)+243 =100+243 =343 b)25×5−2×16×4 =(25×4)+25−(8×10)−(8×5)−8 =100+25−80−40−8 =5−8 =−3 ko spam nha Trả lời
$a) 81 + 243 + 19$
$=(81 + 19)+243$
$=100+243$
$=343$
$b)25×5-2×16 ×4$
$=(25×4)+25-(8×10)-(8×5)-8$
$=100+25-80-40-8$
$=5-8$
$=-3$
a)81+243+19
=(81+19)+243
=100+243
=343
b)25×5−2×16×4
=(25×4)+25−(8×10)−(8×5)−8
=100+25−80−40−8
=5−8
=−3
ko spam nha