26.8-320%-6.8-680%
3.62-1.87-1.62
①5.6+1.79+4.4+8.21
②14.53-(4.53+8.7)
③7600÷25÷4
④17×62-62×7
⑤83×99+83
⑥120+880÷40+60
⑦900÷5×(48-30)
⑧900÷[5×(48-30)]
①33.7-(27.9+3.7)
②8400÷8-23×40
③213×[(22+59)÷9]
④125×56
⑤532+187+468-87
⑥(200+4)×25
⑦101×78
⑧27.89+2.3-7.89
②375÷[840-(495+330)]
③104×25
④25×16×125
⑤24.6-3.98+5.4-6.02
⑥36×97-58×36+61×36
①4.7-1.66-2.34
②4.8+7.44+2.56+5.2
③43000÷125÷8
④36×54+36+45×36
⑤(124-76)×23÷24
⑥270×[128÷(88-24)]