神马作文网请用简便计算来算出结果 梯等式,
来源：学生作业帮 编辑：神马作文网作业帮 分类：数学作业 时间：2024/09/20 08:01:58
请用简便计算来算出结果 梯等式,
12.5×19.7×3.2 2.5×9.7—9.7×0.4 7.8×0.98
68.34×1.4÷68.34×50 15÷7.5÷0.2×4.5
12.5×19.7×3.2 2.5×9.7—9.7×0.4 7.8×0.98
68.34×1.4÷68.34×50 15÷7.5÷0.2×4.5
12.5×19.7×3.2
=12.5×19.7×8×0.4
=12.5×8×19.7×0.4
=100×19.7×0.4
=197×4
=788
2.5×9.7—9.7×0.4
=9.7×(2.5-0.4)
=(10-0.3)×2.1
=10×2.1-0.3×2.1
=21-0.63
=20.37
7.8×0.98
=7.8×(1-0.02)
=7.8-0.156
=7.644
68.34×1.4÷68.34×50
=68.34÷68.34×1.4×50
=1×1.4×50
=70
15÷7.5÷0.2×4.5
=2÷0.2×4.5
=10×4.5
=45
=12.5×19.7×8×0.4
=12.5×8×19.7×0.4
=100×19.7×0.4
=197×4
=788
2.5×9.7—9.7×0.4
=9.7×(2.5-0.4)
=(10-0.3)×2.1
=10×2.1-0.3×2.1
=21-0.63
=20.37
7.8×0.98
=7.8×(1-0.02)
=7.8-0.156
=7.644
68.34×1.4÷68.34×50
=68.34÷68.34×1.4×50
=1×1.4×50
=70
15÷7.5÷0.2×4.5
=2÷0.2×4.5
=10×4.5
=45