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Simple method of solving primary school mathematics problems, 1.2 + 1.4 + 1.6 +. + 8.2 + 8.4 + 8.6 + 8.8 = how much, simple method
1.2 + 1.4 + 1.6 +. + 8.2 + 8.4 + 8.6 + 8.8
(8.8-1.2) △ 0.2 + 1 = 39 numbers added
1.2+1.4+1.6+.+8.2+8.4+8.6+8.8
=(1.2+8.8)x39÷2
=10x39÷2
=195
For a nine digit number, the sum of the numbers in each digit number is 150000. The number in 10000 digits is twice that in 100 million digits. The maximum number is 150000______ The smallest is______ .
If you want to make this number large, you can make the number of hundred million bits 4, then ten thousand bits is 4 × 2 = 8, ten million bits is 15-4-8 = 3, and the rest are 0, that is 430.8 million; if you want to make this number small, you can make the number of hundred million bits 1, ten thousand bits is 2, and there are 15-1-2 = 12 left, so divide it into
Xiaoxiao read a story book. On the first day, she read 2 / 9 of the total pages. On the second day, she read 1 / 4 of the total pages
Xiaoxiao read a story book. On the first day, she read 2 / 9 of the total pages. On the second day, she read 1 / 4 of the total pages. How many pages are left
17 out of 36: not that
Simple calculation: (2.17 + 5.49 + 3.81) * (5.49 + 2.17 + 9.2) - (3.81 + 2.17 + 5.49 + 9.2)*（
（2.17+5.49+3.81）*（5.49+2.17+9.2）-（3.81+2.17+5.49+9.2）*（2.17+5.49）
（2.17+5.49+3.81）*（5.49+2.17+9.2）-（3.81+2.17+5.49+9.2）*（2.17+5.49）
=（2.17+5.49+3.81）*（5.49+2.17）+（2.17+5.49+3.81）*9.2-（3.81+2.17+5.49）*（2.17+5.49）-9.2*（2.17+5.49）
=（2.17+5.49+3.81）*9.2-9.2*（2.17+5.49）
=（2.17+5.49）*9.2+3.81*9.2-9.2*（2.17+5.49）
=3.81*9.2
=35.052
Beijing holds the Olympic Games Beijing holds the Olympic Games this is a math problem of grade 3 in primary school. Each word represents a number
North = 1, Beijing = 4, Ju = 2, ban = 8, Austria = 5, Yun = 7
If you see multiplication and division of six numbers, 80% of them are about 142857
When reading a story book, I read 1 / 4 of the whole book on the first day. On the second day, I read 4 pages less than 2 / 5 of the book. There are 25 pages left. How many pages are there in this book
When reading a story book, I read 1 / 4 of the whole book on the first day, and 4 pages less than 2 / 5 of the book on the second day, leaving 25 pages. The book has (60) pages in total
（25-4）÷（1-1/4-2/5）
=21÷7/20
=60 pages
If you don't understand, please ask
: (- 1 / 2) + 3 1 / 4 + 2.75 + (- 6 1 / 2) (- 2.4) + (- 3.7) + (- 4.2) + 0.7 + (- 4.2)
Well, it's different. I don't know how many questions it is.
(- 1 / 2) + 3 1 / 4 + 2.75 + (- 6 1 / 2) = - 1 / 2 + 3 1 / 4 + 2.75-6 1 / 2 = - (1 / 2 + 6 1 / 2) + (3.25 + 2.75) = - 7 + 6 = - 1 (- 2.4) + (- 3.7) + (- 4.2) + 0.7 + (- 4.2) = - 2.4-3.7 + 4.2 + 0.7-4.2 = - 2.4 - (3.7-0.7) + (4.2-4.2) = - 2.4-3 + 0 = - 5.4
Do you know which number the following four Chinese characters represent? Beijing Olympic Games * 0.9 = Beijing Olympic Games
First of all, we need to find a breakthrough, because the result is three digits, so your "North" and 9 multiplied, the result must be a single digit, so the "North" must be 1, so it is jointly determined that "Yun" is 9, and "Jing" and 9 multiplied can not have carry, because if there is carry, the carry is at least greater than 1, so 9 plus 1, there is carry, so
Xiao Hua read a story book. On the first day, he read one tenth of the book. On the second day, he read 35 pages. On the second day, he read 7 pages, which is exactly 40% of the whole book. How many pages did he read on the first day?
A total of (35 + 7) / (40% - 1 / 10) = 42 △ 0.3 = 140 pages, the first day 140x1 / 10 = 14 pages, please praise ~ click [evaluation] in the upper right corner, and then you can choose [satisfied, the problem has been solved perfectly]. If you agree with my answer, please accept it in time, ~ your adoption is my driving force ~ ~ ~ if there are any new problems
Help me to do some math problems: 15 / 4 ／ 5 / 9 + 3.75 × 5 / 3, 2 / 3 × 0.3 ／ 2 / 3 × 0.3
15 / 4 △ 5 / 9 + 3.75 × 3 / 5
=15/4x9/5+15/4x3/5
=15/4x(9/5+3/5)
=15/4x12/5
=9
2 / 3 × 0.3 △ 2 / 3 × 0.3
=2/3÷2/3x(0.3x0.3)
=1x0.09
=0.09
15 / 4 △ 5 / 9 + 3.75 × 3 / 5 = 9
2 / 3 × 0.3 △ 2 / 3 × 0.3 = 0.09
15 / 4 △ 5 / 9 + 3.75 × 3 / 5
15/4÷5/9+3.75*3/5=15/4*9/5+15/4*3/5=15/4*（9/5+3/5）=9
15/4÷5/9+3.75×3/5
=15/4×9/5+15/4×3/5=15/4×（9/5+3/5）=15/4×12/5=9
2/3×0.3÷2/3×0.3=2/3÷2/3×0.3×0.3=0.09
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