(-3)2 *(-1.2 2)/(-0.3)3 负三的平方乘一点二的平方的相反数除负零点三的相反数
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6.4-2(x+1.2)=0.
(1.2-2x)/0.2-(1.5-2.5x)/0.5-(3x-5)/4=0.急
1.2+1.2^2+1.2^3+ +1.2^20=
1.2X^2-3X-12.1+W+W^2=0.求W^1980+W^1981+…+W^2000
3+2-5+1.2
1.2+1.2^2+1.2^3+1.2^4+1.2^n用简便方法怎么计算
(1+1.2)+(2+1.2×2)+(5+1.2×3)+.(100+1.2×100)
3/2x-2.8+x=0.
2x分之3=0.
3-2(0.2x+1)=0.
(2x-1):3=2.5:0.
(1+1.2x1)+(2+1.2x2)+(3+1.2x3)+.+(100+1.2x100)
(1+1*1.2)+(2+2*1.2)+(3+3*1.2)+.+(100+1*10.2)
将-4,-3,-2,-1,0,1,2,3,4这9个数分别填入图1.2.3-2的方格中,使得横丶竖丶斜对角的3个数相加都得0.
用简便方法计算 (1+1.2)+(2+1.2*2)+(3+1.2*3).(100+1.2*100)=
1+(1*1.2)+2+(2*1.2)+3+(3*1.2)+...+99+(99*1.2)=?简算
2-3(x+1)=1-2(1+0.
3x^2-9x+2=0.求x