– Tell me _____ my phone, Sam.
– It was just beside the briefcase, grandma.
A：where will you find
B：where you will find
C：where did you find
D：where you found
若（2x＋3y）（mx－ny）=9y2－4x2，则m＋n的值为____ .
小强身高1m，爸爸身高170cm，爸爸和小强身高的比是17∶10．
