用递等式计算(能简便的要简便). 71×19+322÷23 [540-(89-21)]×45 7000÷25 34×28+34

2025-03-27 06:11:40
推荐回答(1个)
回答1:

(1)71×19+322÷23
=1349+14
=1363;

(2)[540-(89-21)]×45
=[540-68]×45
=472×45
=21240;

(3)7000÷25
=7000÷100×4
=70×4
=28;

(4)34×28+34×72
=34×(28+72)
=34×100
=3400;

(5)120+480÷(83-23)
=120+480÷60
=120+8
=128;

(6)4000÷125
=4000÷1000×8
=4×8
=32.