16x9+18x2
=4x4x9+18x2
=4x36+36
=4x36+36x1
=36x(4+1)
=36x5=180
\(16\times9+18\times2=8\times2\times9+18\times2\)
\(=18\times\left(8+2\right)=18\times10=180\)
Bài giải
\(16\text{ x }9+18\text{ x }2\)
\(=8\text{ x }2\text{ x }9+18\text{ x }2\)
\(=8\text{ x }18\text{ }+18\text{ x }2\)
\(=18\text{ x }\left(2+8\right)\)
\(=18\text{ x }10\)
\(=180\)
2.8.9+18.2
=8.18+18.2
=18.(8+2)
=18.10
=180
hok tot
Trả lời:
16 x 9 + 18 x 2
= 8 x 2 x 9 + 18 x 2
= 8 x 18 + 18 x 2
= 18 x ( 8 + 2 )
= 18 x 10
= 180
\(16\times9+18\times2\)
\(=144+36\)
\(=180\)
