一质点在二恒力的作用下, 位移为Delta overline (r)=3overline (i)+8overline (j)(m), 在此过程 中, 动能增量为 Delta overline (r)=3overline (i)+8overline (j)(m), 已知其中一恒力Delta overline (r)=3overline (i)+8overline (j)(m), 则另一恒力所作的功为_________ J。(请填写整数)

2f=overline(x)_(1)x_(1)+3overline(x)_(1)x_(3)+4overline(x)_(2)x_(2)-3overline(x)

4.-|||-质点在平面上运动,已知运动方程 overrightarrow (r)=overrightarrow (r)(t) ,速度 overline (v)

填空题-|||-12.一质点在xy平面内做曲线运动,其运动方程为 overline (r)=(t)^2overline (i)+((t)^2-2t)overli

已知函数 F = ABCD + overline(ABC) + overline(ABCD) + overline(BCD)，约束条件为 overline(B)

认真看拼音,规范写词语。-|||-tōng róng ()-|||-mó gu ()-|||-overline (a) y overline (a)mg (

5.设A,B,C为三个随机事件,且 (overline (A)cup overline (B))=0.8 (overline (A)cup overline (

=AB+overline (AC)+overline (BC)+overline (C)D+overline (D) __-|||-__ __

若动点A的加速度合成定理的表达式为(overline {a)_(2)}^n+(overline {a)}_(3)=overline ({a)_(e)}+over

设A，B，C为三个事件，且P(overline(A)cup overline(B))=0.9，P(overline(A)cup overline(B)cup o

设_(xy)=sum _(i=1)^4((x)_(i)-overline (x))((y)_(i)-overline (y))，_(xy)=sum _(i=1)