(8.4-4/5x8.5)x10简便计算
1x2+2x4+3x6+4x8+5x10+.+20x40 简便计算
3/4×27×5/18x8/9=?简便计算
计算:1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8+1/8x9+1/9x10.
1x2+2x4+3x6+4x8+5x10+.+20x40 怎么算?
1.25x8.88简便计算
简便计算:1240x8.4+1.24x2300+12.4x430
(19/4+17/16)x8/1+17/15简便计算
1.5X8.4+3X10分之3+25X10%= 4.5÷(24又7分之5-2.5%X800= 7.5X5分之4-5.5X
递等式两道; 7x8.5+(3.5+1/4x10)除以5 101x1/5-1/5x2
简便计算 1/5x8除以4/5 (26+26/53)除以13 (2/5-1/3)x5/2
(125一50)x8的简便计算
(1.25—0.125)x8简便计算