几道简便计算,麻烦各位了.
来源:学生作业帮 编辑:搜狗做题网作业帮 分类:数学作业 时间:2024/07/24 20:19:32
几道简便计算,麻烦各位了.
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
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
![几道简便计算,麻烦各位了.](/uploads/image/z/4389544-64-4.jpg?t=%E5%87%A0%E9%81%93%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%2C%E9%BA%BB%E7%83%A6%E5%90%84%E4%BD%8D%E4%BA%86.)
9.99×999+9.99
=9.99*1+999*9.99
=(1+999)*9.99
=9990
7.6×7.6+7.6×3.4-7.6
=7.6*7.6+7.6*3.4-7.6*1
=(7.6+3.4+1)*7.6
=12*7.6
=91.2
(1.25+12.5+0.25)×8
=1.25*8+12.5*8+0.25*8
=10+100+1
=111
22.61+9×22.61
=1*22.61+9*22.61
=(1+9)*22.61
=10*22.61
=226.1
=9.99*1+999*9.99
=(1+999)*9.99
=9990
7.6×7.6+7.6×3.4-7.6
=7.6*7.6+7.6*3.4-7.6*1
=(7.6+3.4+1)*7.6
=12*7.6
=91.2
(1.25+12.5+0.25)×8
=1.25*8+12.5*8+0.25*8
=10+100+1
=111
22.61+9×22.61
=1*22.61+9*22.61
=(1+9)*22.61
=10*22.61
=226.1