A barrel of oil weighs 50kg. When it is half finished, the barrel weighs 26kg. How many kilos of oil and barrel?

A barrel of oil weighs 50kg. When it is half finished, the barrel weighs 26kg. How many kilos of oil and barrel?

oil
(50-26)x2
=24x2
=48kg
bucket
50-48 = 2kg

A basket of peaches weighs 50 kg. After selling 35 peaches, the basket weighs 26 kg. What's the weight of this basket of peaches______ Kilogram. What's the weight of the basket______ Kilogram

The specific number of 35 peaches is: 50-26 = 24 (kg), the weight of peaches is: 24 △ 35 = 40 (kg), the weight of the basket is: 50-40 = 10 (kg). Answer: the weight of the basket is 40 kg, the weight of the basket is 10 kg

A barrel of oil weighs 32kg. When 5 / 6 of the oil in the barrel is poured out, the barrel weighs 7kg?

Oil poured out 32-7 = 25kg
25/(5/6)=30kg
That is 30 kg of oil
Then the barrel 32-30 = 2kg

1. There are 84 trees planted in the fifth grade of Ming primary school, 15 more in the sixth grade than in the fifth grade
2. Li Ling is 1.38 meters tall, while Fang Fang is about 1.4 meters tall. Who do you think is taller? Why?
3. A point starts from a point on the number axis. First move 5 units of length to the right, and then move 2 units of length to the left. The number represented by this point is 1. What is the number represented by the starting point?

1.84*2+15=168+15=183
183 trees were planted in the sixth grade
2. Li Ling is taller. Fang Fang is about 1.4 meters tall, but close to 1.4 meters. There should be a certain distance, so Li Ling is taller
3.1+2-5=-3
The starting point is - 3

9. If the height of a cylinder is shortened by 3cm, its surface area will be reduced by 94.2cm, and its bottom radius volume will be reduced by () cm3
9. If the height of a cylinder is shortened by 3 cm, its surface area will be reduced by 94.2 square cm. Its bottom radius is () cm, and its volume is reduced by () cubic cm

9. If the height of a cylinder is shortened by 3 cm, its surface area will be reduced by 94.2 square cm. Its bottom radius is (5) cm, and its volume is reduced by (235.5) cubic cm
Bottom circumference = 94.2 △ 3 = 31.4cm
Bottom radius = 31.4 △ 2 △ 3.14 = 5cm
Bottom area = 3.14 × 5 × 5 = 78.5 square centimeter
Volume reduction = 78.5 × 3 = 235.5 cm3

How many days does the earth go round the sun?

The earth revolves around the sun in 365 days, 5 hours, 48 minutes and 46 seconds. Its rotation is 23 hours, 56 minutes and 4 seconds

1. Before take-off, an aircraft starts to taxi uniformly on a straight runway from a standstill. The acceleration is 4 m / s Square, and taxis for 20 seconds to reach the take-off speed. What is the speed of the aircraft at take-off and the taxiing distance before take-off?
2. A skier starts from the top of the short slope and accelerates to the bottom in 3 seconds
Ask (1) how much distance does the athlete slide in the first second?
(2) How far did the athlete slide in the last second?
3. When an object falls from a suspended helicopter, if the falling motion of the object is regarded as free falling motion, and the falling height of the object in the last second before landing is 9 / 25 of the whole falling height
Find (1) the height of the helicopter
(2) Average speed in the last second
With the formula! Do well in 100 points!

Let V 0 = 0, a = 4 m / S ^ 2, t = 20 m / s, find the solution of V T, s, organic take-off speed V T = V 0 + at = 0 + 4 * 20 = 80 m / s, taxiing distance before take-off s = 0.5 at ^ 2 = 0.5 * 4 * 20 ^ 2 = 800 m 2, let athletes' acceleration be a, then s = 0.5 at ^ 2, that is 9 = 0.5 * a * 3 ^ 2, the solution is a = 2 m / S ^ 2 (1)

A parallelogram, cut it into a square, the perimeter of the square is 20 cm, what is the area of the parallelogram?

A: the area of a parallelogram is 25 square centimeters

Simple calculation in Grade 6: (1) 2 2 / 3 * (1 7 / 8-5 / 6) / [3 1 / 4 / (1 / 8 + 1 5 / 6)] (2) 84 4 / 19 * 1.375 + 105 5 / 19 * 0.9
(1) 2 and 2 / 3 * (1 and 7 / 8-5 / 6) Division [3 and 1 / 4 division (1 / 8 + 1 and 5 / 6)] (2) 84 and 4 / 19 * 1.375 + 105 and 5 / 19 * 0.9
/=Fractional line

=8 / 3 * (1 + 7 / 8-5 / 6) * (1 / 8 + 1 + 5 / 6) / 3 + 1 / 4
= 8/3*（15/8-5/6）*（1/8+11/6）*4/7
=（8/3*15/8-8/3*5/6）*（1/8*4/7+11/6*4/7）
=（5-20/9）*（1/14+22/21）
=25/9*47/42
=1175/378
=(84*19+4)/19*(11/8)+(105*19+5)/19*(9/10)
=4*(21*19+1)/19*11/8+5*(21*19+1)/19*9/10
=11*(21*19+1)/38+9*(21*19+1)/38
=11*(21*19+1)/38+9*(21*19+1)/38
=(21*19+1)/38*(11+9)
=400*10/19
=4000/19

Simplify cos (α + β) - cos (α - β) / sin (α + β) - sin (α - β)-

[cos(α+β)-cos(α-β)]/[sin(α+β)-sin(α-β)]
=[cosαcosβ-sinαsinβ-cosαcosβ-sinαsinβ] /[sinαcosβ+cosαsinβ-sinαcosβ+cosαsinβ]
= -2sinαsinβ/2cosαsinβ
=-tanα