早教吧作业答案频道 -->其他-->
用简便方法计算下面各题.①284+378+122+216②125×5×7×8③82×99④44×27+27×55+27⑤960÷6÷16⑥1352-(352+365)⑦14.25+7.3+5.75+2.7⑧18.23-6.35-2.65⑨16.78-2.54+3.22-1.46
题目详情
用简便方法计算下面各题.
①284+378+122+216 | ②125×5×7×8 | ③82×99 |
④44×27+27×55+27 | ⑤960÷6÷16 | ⑥1352-(352+365) |
⑦14.25+7.3+5.75+2.7 | ⑧18.23-6.35-2.65 | ⑨16.78-2.54+3.22-1.46 |
⑩26.54-(5.23+6.54) |
▼优质解答
答案和解析
①284+378+122+216
=(284+216)+(378+122)
=500+500
=1000;
②125×5×7×8
=(125×8)×(5×7)
=1000×35
=35000;
③82×99
=82×(100-1)
=82×100-82×1
=8200-82
=8118;
④44×27+27×55+27
=(44+55+1)×27
=100×27
=2700;
⑤960÷6÷16
=960÷(6×16)
=960÷96
=10;
⑥1352-(352+365)
=1352-352-365
=1000-365
=635;
⑦14.25+7.3+5.75+2.7
=(14.25+5.75)+(7.3+2.7)
=20+10
=30;
⑧18.23-6.35-2.65
=18.23-(6.35+2.65)
=18.23-9
=9.23;
⑨16.78-2.54+3.22-1.46
=(16.78+3.22)-(2.54+1.46)
=20-4
=16;
⑩26.54-(5.23+6.54)
=26.54-5.23-6.54
=26.54-6.54-5.23
=20-5.23
=14.77.
=(284+216)+(378+122)
=500+500
=1000;
②125×5×7×8
=(125×8)×(5×7)
=1000×35
=35000;
③82×99
=82×(100-1)
=82×100-82×1
=8200-82
=8118;
④44×27+27×55+27
=(44+55+1)×27
=100×27
=2700;
⑤960÷6÷16
=960÷(6×16)
=960÷96
=10;
⑥1352-(352+365)
=1352-352-365
=1000-365
=635;
⑦14.25+7.3+5.75+2.7
=(14.25+5.75)+(7.3+2.7)
=20+10
=30;
⑧18.23-6.35-2.65
=18.23-(6.35+2.65)
=18.23-9
=9.23;
⑨16.78-2.54+3.22-1.46
=(16.78+3.22)-(2.54+1.46)
=20-4
=16;
⑩26.54-(5.23+6.54)
=26.54-5.23-6.54
=26.54-6.54-5.23
=20-5.23
=14.77.
看了 用简便方法计算下面各题.①2...的网友还看了以下:
6、3.125×(1.6+12/5)÷(5/2-0.625)7/5×1/7×6/13+5/7×1/ 2020-04-07 …
某检修小组从A地出发,在东西方的线路上检修线路,如果规定向东行驶为正,向西行驶为负,一天中行驶记录 2020-04-26 …
excel 区域内数字统计如何统计下面这组数据:A B C D E F G H I1 6 9 12 2020-05-16 …
某市对50户居民的家庭存款额进行了调查,数据如下(单位:万元)如下1.6,3.5,2.3,6.5, 2020-06-07 …
集合的运算A={1,3,5}B={2,4,6}C={1,2,3,4,5,6}我们称C是A和B的并集 2020-07-30 …
因式分解(1)4x^2+4x-1(2)8x^6-27x^3y^6(3)5a-8a^2+42(4)3x 2020-10-31 …
我们用a表示不大于a的最大整数,例如[1·5]=1,[-2.5]-3解决以下问题。l,[丌]=?[- 2020-10-31 …
直接写得数.左.5z+左.4=7.6-6.7=5.+1.6=z.82+2.24=7-z.44=6.8 2020-10-31 …
仿照以下推理计算出1+5+5^2+5^3+…+5^2009的值是()为了求1+2+2^2+2^3…+ 2020-11-21 …
4.8×7.5+7.5×5.2可以运用()进行简便运算A.乘法交换律B.乘法结合律4.8×7.5+7 2020-11-27 …