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[50.8-(20+26)]÷0.9638.4×7.6-3.84×66(20+9.774÷2.4)×0.5-1.427[29.7-(6.2+0.85)×3]÷4427÷2.68×16×26.8÷42.7×1610-10.5÷[5.2×14.6-(9.2×5.2+5.4×3.7--数学

[db:作者]  2019-03-20 00:00:00  互联网

题文

[50.8-(20+26)]÷0.96
38.4×7.6-3.84×66
(20+9.774÷2.4)×0.5-1.427
[29.7-(6.2+0.85)×3]÷4
427÷2.68×16×26.8÷42.7×16
10-10.5÷[5.2×14.6-(9.2×5.2+5.4×3.7-4.6×1.5)]-(1.7+1.9)÷0.225×70
(2000-1)+(1999-2)+(1998-3)+…+(1002-999)+(1001-1000)
题型:解答题  难度:中档

答案

(1)[50.8-(20+26)]÷0.96
=[50.8-46]÷0.96,
=4.8÷0.96,
=5;

(2)38.4×7.6-3.84×66
=3.84×76-3.84×66,
=3.84×(76-66),
=3.84×10,
=38.4;

(3)(20+9.774÷2.4)×0.5-1.427
=(20+4.0725)×0.5-1.427,
=24.0725×0.5-1.427,
=12.03625-1.427,
=10.60925;

(4)[29.7-(6.2+0.85)×3]÷4
=[29.7-7.05×3]÷4,
=[29.7-21.15]÷4,
=8.55÷4,
=2.1375;

(5)427÷2.68×16×26.8÷42.7×16
=(427÷42.7)×(26.8÷2.68)×16×16,
=10×10×16×16,
=25600;

(6)10-10.5÷[5.2×14.6-(9.2×5.2+5.4×3.7-4.6×1.5)]-(1.7+1.9)÷0.225×70
=10-10.5÷[5.2×14.6-9.2×5.2-5.4×3.7+4.6×1.5]-3.6÷0.225×70,
=10-10.5÷[(14.6-9.2)×5.2-5.4×3.7+4.6×1.5]-16÷0.225×70,
=10-10.5÷[5.4×5.2-5.4×3.7+4.6×1.5]-16×70,
=10-10.5÷[(5.2-3.7)×5.4+4.6×1.5]-1120,
=10-10.5÷[1.5×5.4+4.6×1.5]÷0.225×70,
=10-10.5÷[(5.4+4.6)×1.5]-1120,
=10-10.5÷[10×1.5]-1120,
=10-10.5÷15-1120,
=10-0.7-1120,
=9.3-1120,
=-1110.7;

(7)(2000-1)+(1999-2)+(1998-3)+…+(1002-999)+(1001-1000)
=2000-1+1999-2+1998-3+…+1002-999+1001-1000,
=(2000+1999+1998+…+1001)-(1+2+3+…+1000),
=(1001+2000)×1000÷2-(1+1000)×1000÷2,
=3001×500-1001×500,
=(3001-1001)×500,
=2000×500,
=1000000.

据专家权威分析,试题“[50.8-(20+26)]÷0.9638.4×7.6-3.84×66(20+9.774÷2.4)×0...”主要考查你对  整数的乘除混合计算及应用  等考点的理解。关于这些考点的“档案”如下:

整数的乘除混合计算及应用

考点名称:整数的乘除混合计算及应用

  • 学习目标:
    理解连乘,连除及混合运算应用题的数量关系,掌握解答方法,进一步掌握所学的运算顺序。

  • 方法点拨:
    乘除法是第二级运算,整数乘除混合计算的顺序是从左到右依次计算。



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