①3(x+1)=2(4x﹣1)
② x4 ﹣ x−12 +5= x+36 .
移项合并得:﹣5x=﹣5,
解得:x=1;
②去分母得:3x﹣6x+6+60=2x+6,
移项合并得:﹣5x=﹣60,
解得:x=12
⑴Where is the school? ____ A. I read books.
⑵How tall is your mom?____ B. He's a postman.
⑶What did you do last Monday?____ C. It's next to the library.
⑷What does your uncle do?____ D. 1. 65 meters.
⑸Do you like watching TV?____ E. Yes,I do.
如图所示,质量为1kg物块自高台上A点以4m/s的速度水平抛出后,刚好在B点沿切线方向进入半径为0.5m的光滑圆弧轨道运动.到达圆弧轨道最底端C点后沿粗糙的水平面运动4.3m到达D点停下来,已知OB与水平面的夹角θ=53°,g=10m/s2(sin53°=0.8,cos53°=0.6).求: