2x8.1+11x9.25+537x0.

来源：学生作业帮编辑：神马作文网作业帮分类：数学作业时间：2024/11/06 11:14:16

41.2x8.1+11x9.25+537x0.19
=41.2x8.1+11x9.25+53.7x1.9
=41.2x8.1+11x（8＋1.25）+（41.2＋12.5）x1.9
=41.2×8.1＋41.2×1.9＋11×8＋11×1.25＋12.5×1.9
=41.2×（8.1＋1.9）＋11×8＋11×1.25＋1.25×19
=41.2×10＋88＋（11＋19）×1.25
=412＋88＋30×1.25
=500＋37.5
=537.5

奥数简便运算41.2X8.1+11X9.25+53.7X1.9 1x8+1 =9 12x8+2=98 123x8+3=987 9x9-1=80 98x9-2=880 987x8-3=8 1x2+2x4+3x6+4x8 ------------------------------- 2x3+4x6+6x9+ 2x2/1x3+4x4/3x5+6x6/5x7+8x8/7x9+10x10/9x11+12x12/11x13 仔细看看（1x2+2x4+3x6+4x8）/（2x3+4x6+6x9+8x12) 1x9+2=11,12x9+3=111,123x9+4=1111,求12345X9+6=?,1234567X9+?=11 1x9+2=11 12x9+3=111 123x9+4=1111类似这种题有哪些 125%X8/25+1.25X0.54+1.25X14%简便运算 2.4x0.19+0.24x8.1 简便运算 7.6x0.19+0.76x8.1怎样用简便方法计算计算：1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8+1/8x9+1/9x10. 已知:x1=1/2+1/3,x2=1/3+1/4,x3=x2+x1,x4=x3+x2.,x10=x9+x8,求：x7/x