\(21\times35+42\times31+63\)
\(=21\left(35+31\times2+3\right)\)
\(=21\times100\)
\(=2100\)
a) \(21\times35+42\times31+63\)
\(=21\times35+21\times2\times31+21\times3\)
\(=21\times35+21\times62+21\times3\)
\(=21\times\left(35+62+3\right)\)
\(=21\times100\)
\(=2100\)
_Chúc bạn học tốt_
Trả lời:
\(21\cdot35+42\cdot31+63\)
\(=21\cdot\left(35+31\cdot2+3\right)\)
\(=21\cdot100\)
\(=2100\)
Hc tốt #
21×35+42×31+63
=21×35+21×2×31+21×3
=21×35+21×62+21×3
=21×(35+62+3)
=21×100
=2100
21*35+42*31+63
=21*(35+31*2+3)
=21*100
=2100
