下面计算的对吗?对的打对,不对的请改正.
来源:学生作业帮 编辑:百度作业网作业帮 分类:数学作业 时间:2024/06/16 08:16:12
下面计算的对吗?对的打对,不对的请改正.
2.5×7.5×0.5 8.5×99
=2.5×(7.5-7.5)×0.5 =8.5×(99+1)
=2.5×0×0.5 =8.5×100
=0 ( ) =850 ( )
12.5×3.2×0.25 1.25×(8+0.8)
=(12.5×0.8)×(4×0.25) =1.25×8+0.8
=10×1 =10+0.8
=10 ( ) =10.8 ( )
( ) ( )
还要改正啊
2.5×7.5×0.5 8.5×99
=2.5×(7.5-7.5)×0.5 =8.5×(99+1)
=2.5×0×0.5 =8.5×100
=0 ( ) =850 ( )
12.5×3.2×0.25 1.25×(8+0.8)
=(12.5×0.8)×(4×0.25) =1.25×8+0.8
=10×1 =10+0.8
=10 ( ) =10.8 ( )
( ) ( )
还要改正啊
![下面计算的对吗?对的打对,不对的请改正.](/uploads/image/z/3100341-21-1.jpg?t=%E4%B8%8B%E9%9D%A2%E8%AE%A1%E7%AE%97%E7%9A%84%E5%AF%B9%E5%90%97%3F%E5%AF%B9%E7%9A%84%E6%89%93%E5%AF%B9%2C%E4%B8%8D%E5%AF%B9%E7%9A%84%E8%AF%B7%E6%94%B9%E6%AD%A3.)
1 错 2 错 3 对 4错
1订2.5×7.5×0.5
=2.5×4×2×7.5×0.5/(2×4)
=10×1×7.5/8
=75/8
=9.375
2订8.5×99
=8.5×(100-1)
=8.5×100-8.5×1
=850-8.5
=841.5
4订1.25×(8+0.8)
=1.25×8+1.25×0.8
=10+1
=11
1订2.5×7.5×0.5
=2.5×4×2×7.5×0.5/(2×4)
=10×1×7.5/8
=75/8
=9.375
2订8.5×99
=8.5×(100-1)
=8.5×100-8.5×1
=850-8.5
=841.5
4订1.25×(8+0.8)
=1.25×8+1.25×0.8
=10+1
=11