101 × 1/5 – 1/5 × 21
2个回答
101x1/5-1/5x21
=(101-21)x1/5
=80x1/5
=16
相关问题
1×(1/3)+3×(1/5)+5×(1/7)+...+99×(1/101)=多少?
计算:[1/1×3]+[1/3×5]+[1/5×7]+…+[1/99×101].
1/1×3+1/3×5+1/5×7+.+1/99×101怎么做
1/1×3+1/3×5+1/5×7+.+1/99×101=(2/1×3+2/3×5+2/5×7+.+2/99×
1×3×5+3×5×7+5×7×9+…+101×103×105=?
2.1×1.1×0.54÷(5.4×1.21÷[5/21])=______.
1×1/3+1/3×1/5+1/5×1/7+1/7×1/9+……+1/99×1/101
计算: 1/1×5+1/5×9+1/9×13+1/13×17+1/17×21+1/21×25 456+979×455/4
计算1/(1×3)+1/(3×5)+1/(5×7)+1/(7×9)+.+1/(19×21)
一道关于数列的求和题目1/1×3 + 1/3×5 +1/5×7 +.+ 1/99×101=