Question

tình nhanh

45+25+45+25+10

Answer 1

`45+25+45+25+10`

`=(45+45+10)+(25+25)`

`=100+50`

`=150`

Answer 2

    45 + 25 + 45 + 25 + 10

= ( 45 + 45 + 10 ) + ( 25 + 25)

= 100 + 50

= 150

Answer 3

=(45+45)+(25+25)+10

= (95+50)+10

=145+10

=155

Answer 4

45 + 25 + 45 +25 + 10

= 45 x 2 + 25 x 2 + 10

=90 + 50+10

=150

Answer 5

150

 

Answer 6

\(\text{45+25+45+25+10}=\left(45+25\right)x2+10=70x2+10=140+10=150\)

HỌC SINH GIỎI LỚP 3 VẪN LÀM DC