几道简便计算,麻烦各位了.

来源:百度知道 编辑:UC知道 时间:2024/05/24 01:49:43
9.99×999+9.99 7.6×7.6+7.6×3.4-7.6

(1.25+12.5+0.25)×8 22.61+9×22.61

以上几题要有过程 快一点啊!!!!!

9.99×999+9.99
=9.99×(999+1)
=9.99×1000
=9990

7.6×7.6+7.6×3.4-7.6
=7.6×(7.6+3.4-1)
=7.6×10
=76

(1.25+12.5+0.25)×8
=1.25×8+12.5×8+0.25×8
=10+100+2
=112

22.61+9×22.61
=22.61×(1+9)
=22.61×10
=226.1

以上几题要有过程 快一点啊!!!!!

9.99×999+9.99 7.6×7.6+7.6×3.4-7.6
=9.99×999+9.99×1 =7.6×(7.6+3.4-1)
=9.99×(999+1) =7.6×10
=9.99×1000 =76
=9990
(1.25+12.5+0.25)×8
=1.25×8+12.5×8+0.25×8
=10+100+2
=112
22.61+9×22.61
=22.61×1+9×22.61
=22.61×(1+9)
=22.61×10
=226.1