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Several mathematical problems 1. Given a * b = (a + b) - (a-b), find the value of 9 * 2 2. A * b = 3A + 2b-1 (1) And find the value of 5 * 6 (2) And (3 * 4) * 2 3. If a * b = (a + b) × (a + b) - 1, find the value of 12 * 3 4、3#4=3+13+113+1113 2#3=2+12+112 (1) Find the value of 5 × 4 (2) If 6#x = 1254, find the value of X 5、 4@3=4 ×6×8 3@4=3 ×5×7×9 (1) , seeking 2@4 The value of (2) , known 9@y=1287 And find the value of Y
1.9*2=(9+2)-(9-2)=4
2.5*6=3×5+2×6-1=26
(3*4)*2=(3×3+2×4-1)*2=16*2=3×16+2×2-1=51
3.12*3=(12+3)×(12+3)-1=224
In 4.3 × 4, 3 is the first item and 4 is the number of items
5#4=5+15+115+1115=1250
6 × 4 = 6 + 16 + 116 + 1116 = 1254, so x = 4
five 2@4=2 *4*6*8=384
9@3=9 *11 * 13 = 1287, so y = 3
The students in the feeding group of Xingguang primary school raised some rabbits, of which the number of white rabbits was three times that of black rabbits? (solution of a series of equations)
Suppose there are x Black rabbits, & nbsp; 3x-x = 8, & nbsp; & nbsp; 2x = 8, 2x ／ 2 = 8 ／ 2, x = 4, 4 × 3 = 12, answer: there are 12 white rabbits and 4 Black rabbits
The fast train and the slow train go from place a to place B. the slow train starts more than 1 / 6 of the whole journey by 20 kilometers before the fast train starts. When the fast train reaches the midpoint, the slow train has already exceeded 50 kilometers, and the last two trains arrive at place B at the same time. How many kilometers are there between a and B?
If the express train runs from the midpoint to B, and the local train runs less than 50 km half way, then the express train runs from a to B, and the local train runs less than 100 km in the whole journey. From the title, more than 1 / 6 of the whole journey and 20 km is 100 km, that is, the distance between AB and ab is (100-20) △ 1 / 6 = 480 km
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