3+2-5+1.2

3+2-5+1.2 (1+1.2）＋(2+1.2×2)＋（5+1.2×3)+.(100+1.2×100) 1.2+1.2^2+1.2^3+ +1.2^20= 14/5+2/3x=1.2 解方程 5(x-1.2)-3(x+2)=4.8 4+1.2(x-3)+2(x-5)怎么解 0.4×( )=3/2×( )=( )×5=1.2×( ) 3(x+1.2)-2(x+0.5)=5 1.2乘以5分之3 P21 1.2 .3 .4 .5 5,四1.2.3英语 1.2+1.2^2+1.2^3+1.2^4+1.2^n用简便方法怎么计算 是初一一元一次方程的问题?a-1=5+2a0.3X+1.2-2X=1.2-2.7x 5x-3=3x-1+2-2x=1.2-2.7x 1.2+√3 2.√2+√5 3.√2-√3 精确到0.01. 计算{-3/4}*{-8+2/3-4/3}和{-1.2}*{-5/8}+{-24}*1/12 12-2/7-5/7和1/5-1.2*(3/4-7/12 )的简算 解方程1.8-8x/1.2-1.3-3x/2-5x-0.4/0.31.8-8x/1.2-1.3-3x/2-5x-0.4/0.3=0