用简便方法计算。878x125-78×1251000÷125÷8×259用简便方法计算。878x125-78×1251000÷125÷8×2599×23+23399×25

Question

用简便方法计算。 878x125-78×125 1000÷125÷8×25 9
用简便方法计算。
878x125-78×125 1000÷125÷8×25
99×23+23 399×25

Answer 1

878x125-78×125
=（878-78）x125 运用乘法分配律
=800x125
=100000

1000÷125÷8×25
=1000÷（125x8）x25
=1000÷1000x25
=25

99×23+23
=99x23+23x1 运用乘法分配律
=（99+1）x23
=100x23
=2300

399×25
=(400-1)x25
=400x25-1x25
=10000-25
=9975

祝学习进步。