第1个回答 2014-10-31
①1.83+3.79+0.17
=(1.83+0.17)+3.79
=2+3.79
=5.79
②17.85-4.34-5.66
=17.85-(4.34+5.66)
=17.85-10
=7.85
③85.7-(15.7-4.8)
=85.7-15.7+4.8
=70+4.8
=74.8
④(125+70)×8
=125×8+70×8
=1000+560
=1560
⑤312×4+188×4
=(312+188)×4
=500×4
=2000
⑥125×25×8×4
=(125×8)×(25×4)
=1000×100
=100000