用地毯式计算五计算下面各题1978+104x98。
发布网友
发布时间:2022-12-24 01:00
我来回答
共1个回答
热心网友
时间:2023-10-06 04:17
4.8x0.25
=1.2×(4×0.25)
=1.2×1
=1.2
0.78x98
=0.78×(100-1)
=0.78×100-0.78
=78-0.78
=77.22
0.5x2.33x8
=(0.5×8)×2.33
=4×2.33
=9.32
1.5x105
=1.5×(100+5)
=1.5×100+1.5×5
=150+7.5
=157.5
0.3x2.5x0.4
=0.3×(2.5×0.4)
=0.3×1
=0.3
1.2x2.5+0.8x2.5
=(1.2+0.8)×2.5
=2×2.5
=5