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How to solve the equation: 12 / 13 + x = 1?
X=1-12/13
=13/13-12/13
=1/13
The solution equation: x + 1 / 8 = 7 / 8, 1 / 13 + x = 8 / 13, x-4 / 15 = 7 / 15, X-7 / 19 = 8 / 19
x=6/8,x=7/13,x=11/15,x=15/18
The price of taxi in Yangjiang is 4 yuan for less than 2 kilometers (including 2 kilometers), and 1.4 yuan for every kilometer after more than 2 kilometers. Xiaoming's house is 15 kilometers away from his grandmother's house______ Yuan
4 + 1.4 × (15-2), = 4 + 1.4 × 13, = 4 + 18.2, = 22.2 yuan; a: it costs him 22.2 yuan to take a taxi to grandma's house
If the length of a rectangle is increased by 5cm, the area will be increased by 40cm2; if the width is increased by 5cm, the area will be increased by 60cm2
If the length and width are increased by 5cm at the same time, how much square cm is the area increased?
The width is 40 △ 5 = 8 cm
The length is 60 △ 5 = 12 cm
The original area is 8X12 = 96 square centimeters
Now it's (12 + 5) x (8 + 5) = 221 square centimeters
Add 221-96 = 125 square centimeters
In △ ABC, we know that a ^ 2-bc-2c ^ 2 = 0, a = √ 6, cosa = 7 / 8, then the area s of triangle ABC is?
The answer is (√ 15) / 2
b²-bc-2c²=0
(b+c)(b-2c)=0
B + C is not equal to 0, so B = 2C
According to the cosine theorem
b²+c²-2bc*cosA=a²
4c²+c²-4c²*(7/8)=6
5c²-(7c²/2)=6
3c²/2=6,c²=4,c=2,b=2c=4
Sina = (root 15) / 8
Triangle area s
＝(1/2)*b*c*sinA
= (1 / 2) * 8 * (root 15) / 8
= (root 15) / 2
Given that a and B are reciprocal to each other, what is the result of a divided by 3 of B
6 (a * b)
Use a piece of iron wire to form a square. The side length of the square is 471 cm. If you use this piece of iron wire to form a circle, how many cm is the diameter of the circle?
471 × 4 / 3.14 = 1884 / 3.14 = 600 (CM) a: the diameter of this circle is 600 cm
Let the x power of a = 2 times the Y power of 3 times the Z power of 5, and X, y, Z are all non negative integers, then the number of a with a greater than or equal to 1 and less than or equal to 10 is zero
That is, a = 2 ^ x * 3 ^ y * 5 ^ Z
From this, we can get the value range X = 0, 1, 2, 3, y = 0, 1, 2, z = 0, 1
1、2、3、4、5、6、8、9、10
9 in total
Mathematical error prone questions should be applied
1. There is 500 g of 20% salt water (1) how many g of salt can be added to make it 25% (2) how many g of water can be added to dilute it to 12% salt water (2)
A cylinder with a bottom radius of one decimeter and a height of 5cm has a side area of (), a surface area of (), and a volume of ()
Radius = 1 decimeter = 10 cm
Lateral area
=2×3.14×10×5
=314 square centimeters
Surface area
=2 × bottom area + side area
=2×3.14×10²+314
=942 square centimeters
volume
=3.14×10²×5
=1570 CC
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