20/19-(5/3+2×8/1)
1个回答
=20/19-(5/3+4/1)
=20/19-(20/12+20/5)
=20/19-20/17
=20/2
=10/1
相关问题
1×2+2×3+3×4+4×5+5×6+……+19×20
简算1/(2×3)+1/(3×4)+1/(4×5)+……+1/(18×19)+1/(19×20)
计算:1×2²+2×3²+3×4²+...+18×19²+19×20²
﹙7.2×9分之1﹚x-2.4=3.2 8.19×3.1-8.19-10×8.19%
因为1/1×2=1-1/2,1/2×3=1/2-1/3.1/19×20=1/19-1/20
8.5+3.2= 2×35= 9.8-4.8= 8-2.5= 9+0.1= 20-19.7= 8-0.72= 3.9+2
1/2×3+1/3*4+1/4*5+.+1/19*20=?
1×2+2×3+3×4...+19×20+20×21=(分数)
1/1×2×3×4+1/2×3×4×5+1/3×4×5×6+……+1/17×18×19×20