(-191919×9898+989898×1919)÷(-0.5+3.14)=
1.(96分之19+9696分之1919+969696分之191919)÷96969696分之19191919
简算:(19/91+1919/9191+191919/919191)÷19191919/91919191
191919/767676-7676/1919=
191919/767676-7676/1919
(3.14×20)/(3.14×0.5)
(3分之1×3.14×3²×10)÷(3.14×4²)=
一元二次方程 (3.14×2x÷4)+x+(3.14x²÷x)+(3.14x²÷x-x)=15.7
1.5÷[45-(13×3.14×92)÷(3.14×6
3.14xX²+3.14x(X÷2)²=100
19.6÷0.4÷0.5= (用简便算法)
0.5:3分之2=9÷( )=( )%
191919/767676-7676/1919 简算