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The number of columns in order is given: 2 - 48 - 1632 The sixth and seventh numbers are () The number of columns in order is given: 2 - 48 - 1632 The sixth and seventh numbers are (the nth number is（
Finding unknowns (Grade 5)
4×（X-2/5)=1/5
Don't make a mistake. Four is followed by a multiplier sign, and in brackets is an English X
4×（X-2/5)=1/5
X-2 / 5 = 1 / 5 divided by 4
X-2/5=1/20
X=1/20+2/5
x=9/20
That's what I think, right!
Finding unknown number x in sixth grade
x: 12 = 4.75:80.28: r = 3.75:7.5 1:8 3 of 2 = x: 11 of 2
x:12＝4.75:8
x=12×4.75÷8
x=7.125
0.28:r＝3.75:7.5
r=0.28×7.5÷3.75
r=0.56
1 / 2:3 / 8 = x: 11 / 2
x=11/2×1/2÷3/8
x=11/4×8/3
x=22/3
Find the unknown number x, sixth grade primary school
4（2x-1)-2(x-1)=28 0.5/x=0.3/x-18 13/14×7+4x=750%
9 / 8 to 1 / 3 = x to 8 / 3
4 (2x-1) - 2 (x-1) = 8x-4-2x 2 = 6x-2 = 28, so 6x = 30, x = 5
2.0.5/x = (0.3-18x) / x, so 0.3-18x = 0.5 x = (- 1) / 90
3.13×7÷14 4X=7.5 4X=7.5-（13×7÷14） X=1/4=0.25
4.X=9
3 / 4: x = 16 / 21: 8 / 9: 5 / 8: x = 7 / 12: 4 / 5
5 / 8: x = 7 / 12: 7x-6.5x = 48
3 / 4: x = 16 / 21: 8 / 9: 5 / 8: x = 7 / 12: 4 / 21x = 3 / 4x8 / 9 7 / 12x = 4 / 5x5 / 8 16 / 21x = 2 / 3
Enlarge the triangle on the left to get the triangle on the right and find the unknown X
The triangle on the left side is 5m long and 4cm wide, and the triangle on the right side is xcm wide and 6cm wide. We need to find the unknown X by solving the proportion
5-4 = X-6, so x = 7.5
A mathematical problem, set unknown number to solve the problem
A. The distance between two places is 60km. After a starts from a to B for 2.5 hours, B goes from a to B, and then a arrives at B 10 minutes later than B. It is known that B's speed is five times of a's speed. How to find B's speed
Let a speed be x, B speed be 5x, and B time from a to B is 60 / 5x = 12 / X
10 minutes = 1 / 6 hour
2.5X+(12/X+1/6)X=60
2.5X+12+X/6=60
15X+72+X=360
16X=288
X=18
B speed = 5x = 90
Solving mathematical problems with unknowns
There are 2600 cubic meters of water in pool a and 1200 cubic meters of water in pool B. if the water in pool a flows into pool B at the rate of 23 cubic meters per minute, how many minutes later, the water in Pool B is four times that of pool a?
After X minutes, the water in Pool B is four times that in pool a
4(2600-23x)=1200+23x
x=80
A: after 80 minutes, the water in Pool B is four times that in pool a
When did primary school learn to solve math problems with unknowns?
Textbooks may not be the same, general 3-5
Solving mathematical algebra problems
If C is a positive integer, a, B, C, D, e, f are integers and satisfy a + B = C, B + C = D, D + C = e, e + F = a, then the minimum value of a + B + C + D + e + F is?
All converted to C and Ba = c-bb = BC = CD = B + CE = D + C = B + C + C = B + 2cf = A-E = C-B - (B + 2C) = - c-2ba + B + C + D + e + F = (C-B) + B + C + (b + C) + (B + 2C) + (- c-2b) = C-B + B + C + B + C + B + B + 2c-c-2b = 4cc is a positive integer, so the minimum value is 14C = 4, so a +
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