Question

tính nhanh

145 + 145 x 2 + 145

Answer 1

=145x(1+2+1)=145x4=580

Answer 2

145+145X145+145= 145x4=580

Answer 3

tính nhanh

145 + 145 x 2 + 145

=190+190

=380

Answer 4

145+145=190x2 =380+145=425

Answer 5

145 + 145 x 2 + 145

= (145 + 145) + 145 x 2

=       290       + 290

=       580

hoặc 

145 + 145 x 2 + 145

= 145 x (2 + 1 + 1)

= 145 x 4 

= 580

Answer 6

\(145+145\cdot2+145=145\cdot1+145\cdot2+145\cdot1=145\cdot\left(1+2+1\right)=145\cdot4=580\)