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用递等式计算(能简便的要简便)1900-8640÷247.45-1.55-3.4515000÷1259800÷(49×25)5.29-4.71+15.2956.4-2.89+12.6-7.11125×(8+4)725-(325÷25+87)÷4
题目详情
用递等式计算(能简便的要简便)
1900-8640÷24 | 7.45-1.55-3.45 |
15000÷125 | 9800÷(49×25) |
5.29-4.71+15.29 | 56.4-2.89+12.6-7.11 |
125×(8+4) | 725-(325÷25+87)÷4 |
▼优质解答
答案和解析
①1900-8640÷24
=1900-360
=1540
②7.45-1.55-3.45
=7.45-(1.55+3.45)
=7.45-5
=2.45
③15000÷125
=15×1000÷125
=15×8
=120
④9800÷(49×25)
=9800÷49÷25
=200÷25
=8
⑤5.29-4.71+15.29
=0.58+15.29
=15.87
⑥56.4-2.89+12.6-7.11
=(56.4+12.6)-(2.89+7.11)
=69-10
=59
⑦125×(8+4)
=125×8+125×4
=1000+500
=1500
⑧725-(325÷25+87)÷4
=725-(13+87)÷4
=725-100÷4
=725-25
=700
=1900-360
=1540
②7.45-1.55-3.45
=7.45-(1.55+3.45)
=7.45-5
=2.45
③15000÷125
=15×1000÷125
=15×8
=120
④9800÷(49×25)
=9800÷49÷25
=200÷25
=8
⑤5.29-4.71+15.29
=0.58+15.29
=15.87
⑥56.4-2.89+12.6-7.11
=(56.4+12.6)-(2.89+7.11)
=69-10
=59
⑦125×(8+4)
=125×8+125×4
=1000+500
=1500
⑧725-(325÷25+87)÷4
=725-(13+87)÷4
=725-100÷4
=725-25
=700
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