Bài làm :
Ta có :
45.48-90.24+145
=45.48-45.48+145
=0+145
=145
bằng 1225
mong bạn tích cho mk
\(45\cdot48-90\cdot24+145\)
\(=45\cdot2\cdot24-90\cdot24+145\)
\(=90\cdot24-90\cdot24+145\)
\(=0+145\)
\(=145\)
\(45.48-90.24+145\)
\(=45.48-45\cdot2\cdot24+145\)
\(=45\cdot48-45\cdot48+145\)
\(=0+145\)
\(=145\)
