巧算 (1)5×999+5+99×7+7+3×9+3 = = = = = (2)99999+巧算(1)5×999+5+99×7+7+3×9+3= ====(2)99999+9999+999+99+9+5======
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巧算(1)5×999+5+99×7+7+3×9+3=====(2)99999+巧算(1)5×999+5+99×7+7+3×9+3=====(2)99999+9999+999+99+9+5======巧
巧算 (1)5×999+5+99×7+7+3×9+3 = = = = = (2)99999+巧算(1)5×999+5+99×7+7+3×9+3= ====(2)99999+9999+999+99+9+5======
巧算 (1)5×999+5+99×7+7+3×9+3 = = = = = (2)99999+
巧算
(1)5×999+5+99×7+7+3×9+3
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(2)99999+9999+999+99+9+5
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巧算 (1)5×999+5+99×7+7+3×9+3 = = = = = (2)99999+巧算(1)5×999+5+99×7+7+3×9+3= ====(2)99999+9999+999+99+9+5======
5x999+5+99x7+7+3x9+3+9
=5×1000+7×100+3×10+9
=5739
巧算 (1)5×999+5+99×7+7+3×9+3 = = = = = (2)99999+巧算(1)5×999+5+99×7+7+3×9+3= ====(2)99999+9999+999+99+9+5======
5×999+5×99×7+7+3×9+3+9用简便方法计箅
计算:(+1)+(-3)+(+5)+(-7)+⋯+(+97)+(-99)
1+3+5+7+9+⋯+97+99 用脱式简便计算.
1+3+5+7+9+……+999等于多少?要公式的
(1+3+5+7+……+99+101)-(2+4+6+8+……+98+100)怎么写
巧算:1/1×3+ 1/3×5+ 1/5×7 + …… +1/17×19
1+3+5+7+9+...+59 1/99+2/99+...+55/99 急
1-3+5-7+9-11+...+97-99
9又1/7+99又2/7+999又3/7+9999又4/7+99999又5/7+999999又6/7简算
(+1)+(-2)+(+3)+(-4)+.+(+99)+(-100)=?(+1)+(-3)+(+5)+(-7)+.+(+17)+(—19)=?
1+3+5+7+9+11+13+15+17+19+21=()
1-3+5-7+9-11+…+97-99+100=?
1×3/1+3×5/1+5×7/1+...+99×101/1 的值说方法!
请猜想1+3+5+7+9+……+(2n+1)+(2n+3)=?
求几题简便计算算法.(1)5.3×99+5.3一30(2)2.23×5分之2+2.77÷2.5(3)9999+999+99+9(4)8分之7÷{3分之1×(2分之3一4分之3)}2.23×5分之2+2.77÷2.5
1+3+5+7一直加到99的简便运算
1+3+5+7+9+...+99+101 要简便.