作业帮4321×1234-4322×1233 7.2×61.3+73.8×2.8
来源：学生作业帮 编辑：作业帮 分类：数学作业 时间：2024/05/17 08:25:32
4321×1234-4322×1233 7.2×61.3+73.8×2.8
急.
4321×1234-4322×1233 、、、、和、、、、 7.2×61.3+73.8×2.8
急.
4321×1234-4322×1233 、、、、和、、、、 7.2×61.3+73.8×2.8
4321×1234-4322×1233
=4321×1234-4321×1233-1333
=4321×（1234-1233）-1333
=4321-1333
=2988
7.2×61.3+73.8×2.8
=7.2×61.3+61.3×2.8+12.5×2.8
=61.3×（7.2+2.8）+12.5×8×0.4
=61.3×10+100×0.4
=613+40
=653
=4321×1234-4321×1233-1333
=4321×（1234-1233）-1333
=4321-1333
=2988
7.2×61.3+73.8×2.8
=7.2×61.3+61.3×2.8+12.5×2.8
=61.3×（7.2+2.8）+12.5×8×0.4
=61.3×10+100×0.4
=613+40
=653