数学问题!急!求教方法!(1)699998+69998+6998+698+68(2)37.9×94+37.9×7-37.9 (3)888×111+444×778(4)1995+1996+1997+1998+1999+2000+2001+2002+2003+2004+2005(5)3.4×56.7+66×5.67 2. 1÷[(15-□)×1.6 ] =0.25
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![数学问题!急!求教方法!(1)699998+69998+6998+698+68(2)37.9×94+37.9×7-37.9 (3)888×111+444×778(4)1995+1996+1997+1998+1999+2000+2001+2002+2003+2004+2005(5)3.4×56.7+66×5.67 2. 1÷[(15-□)×1.6 ] =0.25](/uploads/image/z/8686808-8-8.jpg?t=%E6%95%B0%E5%AD%A6%E9%97%AE%E9%A2%98%21%E6%80%A5%21%E6%B1%82%E6%95%99%E6%96%B9%E6%B3%95%21%EF%BC%881%EF%BC%89699998%EF%BC%8B69998%EF%BC%8B6998%EF%BC%8B698%EF%BC%8B68%EF%BC%882%EF%BC%8937.9%C3%9794%2B37.9%C3%977%EF%BC%8D37.9+%EF%BC%883%EF%BC%89888%C3%97111%2B444%C3%97778%EF%BC%884%EF%BC%891995%2B1996%2B1997%2B1998%2B1999%2B2000%2B2001%2B2002%2B2003%2B2004%2B2005%EF%BC%885%EF%BC%893.4%C3%9756.7%2B66%C3%975.67+2.+++++1%C3%B7%5B%EF%BC%8815%EF%BC%8D%E2%96%A1%EF%BC%89%C3%971.6+%5D+%3D0.25)
数学问题!急!求教方法!(1)699998+69998+6998+698+68(2)37.9×94+37.9×7-37.9 (3)888×111+444×778(4)1995+1996+1997+1998+1999+2000+2001+2002+2003+2004+2005(5)3.4×56.7+66×5.67 2. 1÷[(15-□)×1.6 ] =0.25
数学问题!急!求教方法!
(1)699998+69998+6998+698+68
(2)37.9×94+37.9×7-37.9
(3)888×111+444×778
(4)1995+1996+1997+1998+1999+2000+2001+2002+2003+2004+2005
(5)3.4×56.7+66×5.67
2. 1÷[(15-□)×1.6 ] =0.25 □=( )
数学问题!急!求教方法!(1)699998+69998+6998+698+68(2)37.9×94+37.9×7-37.9 (3)888×111+444×778(4)1995+1996+1997+1998+1999+2000+2001+2002+2003+2004+2005(5)3.4×56.7+66×5.67 2. 1÷[(15-□)×1.6 ] =0.25
(1)原式=(700000-2)+(70000-2)+(7000-2)+(700-2)+(70-2)=777770-10=777760
(2)原式=37.9×(94+7-1)=37.9×100=3790
(3)原式=111×(888+4×778)=444×(222+778)=444000
(4)原式=(1995+2005)+(1996+2004)+(1997+2003)+(1998+2002)+(1999+2001)=20000
(5)原式=56.7×(3.4+6.6)=567
2 (15- )×1.6=4 那个空为12.5