作业帮小数乘法推广到小数 全对给50分!
来源：学生作业帮 编辑：拍题作业网作业帮 分类：数学作业 时间：2024/04/28 09:16:42
小数乘法推广到小数 全对给50分!
3.4×7×1.5 1.25+4.6+0.75 2.33×0.5×0.4×5 1.6×7.5×1.25
=
=
3.4×7×1.5 1.25+4.6+0.75 2.33×0.5×0.4×5 1.6×7.5×1.25
=
=
3.4×7×1.5
=1.7 ×（2 ×1.5） ×7
=1.7 ×3 ×7
=5.1 ×7
=35.7
1.25+4.6+0.75
=1.25+0.75+4.6
=2+4.6
=6.6
2.33×0.5×0.4×5
= 2.33×0.5×（0.4×5）
= 2.33×（0.5×2）
= 2.33×1
=2.33
1.6×7.5×1.25
= 4×0.4 ×7.5×1.25
=（4×1.25）×（0.4×7.5）
=5×3
=15
=1.7 ×（2 ×1.5） ×7
=1.7 ×3 ×7
=5.1 ×7
=35.7
1.25+4.6+0.75
=1.25+0.75+4.6
=2+4.6
=6.6
2.33×0.5×0.4×5
= 2.33×0.5×（0.4×5）
= 2.33×（0.5×2）
= 2.33×1
=2.33
1.6×7.5×1.25
= 4×0.4 ×7.5×1.25
=（4×1.25）×（0.4×7.5）
=5×3
=15