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Fill in the blank with "+, -, *" to make the equation true, (109 8) (7 65) (43 21) = 1998
0
Fill in the space below 0 1 2 3 4 5 6 7 8 9 respectively to make the equation true ( )+( )=( )*( )+（ ）=（ ）（ ）-( )=( ) ( ) ( )+( )=( ) ( )( ) -（ ）= ( ) （ ）*（ ）-( )=( ) I'm really sorry,
All of them were excluded by the exclusion method, but they didn't find out
1 2 3 4 5 6 7 8 = 9 fill in the space with "+" - "*" to make the equation true
1*2+3+4+5-6-7+8=9
Add + and - signs to the following formula where appropriate to make the equation true 9______ 8______ 7______ 6______ 5______ 4______ 3______ 2______ 1=23．
9-8+7+6+5+4-3+2+1=23；
So the answer is: -, +, +, +, -, +, +
Fill in the box with the nine numbers 1.2.3.4.5.6.7.8.9 to make the equation true (1 / 2 × 1 / 3 × 1 / 3)
219=1/2*438=1/3*657
The equation can be established by filling the nine numbers 1.2.3.4.5.6.7.8.9 in brackets. The equation can be established. () () * () () = () () * () () = () () () * () () = 3634
An equal sign is added
3634=2*23*79
So (4) (6) * (7) (9) = (2) (3) * (1) (5) (8) = 3634
Fill in the box with the nine numbers 1,2,3,4,5,6,7,8,9 to make the equation hold Fill in the box with the nine numbers 1, 2, 3, 4, 5, 6, 7, 8, 9 to make the equation true () () * () = () * () = () () ()
29*6=3*58=174
39*4=2*78=156
58*3=6*29=174
78*2=4*39=156
Please fill in the box with the six numbers 3, 5, 6, 7, 8, 9. They are the three equations that hold 1 + = 2 +? 4 +?
The reasons are as follows
4 +? Only possible
1) 4 + 3 = 7, the remaining 568 9 observed that the difference between 5,6 or 8,9 1 + can not satisfy 2 +? Therefore, it is omitted
2) 4 + 5 = 9, and the remaining 3, 6, 7, 8 observation shows that the difference of 6,7 or 7,8 satisfies 1 +=
If 8-3 is not equal to 2, 6-3 is not equal to 2, then 2 + cannot be satisfied, so it is omitted
To sum up, there is no solution to the problem
Moving a match stick in junior high school
12-11 = 1 (move the vertical bar of the plus sign before 2)
4 + 2-1 = 5 (move the vertical line on the right to become 5) or 4 + 7-11 = 0 (move the horizontal line below 2 to 1, and turn it into 11)
Move only one matchstick so that the equation 1 + 7-13 = 44
Absolutely right. I did 1 + 7-13 = 44 to 117-73 = 44
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