If the areas of two circles are equal, their circumference must be equal The circumference of a semicircle is half the circumference of a circle

If the areas of two circles are equal, their circumference must be equal The circumference of a semicircle is half the circumference of a circle

That's right

Calculation problems of grade four in the second semester
100 lines, no address

The formula calculation: 360 △ [(12 + 6) × 5] 288 △ [(26-14) × 8] 500 × 6 - (50 × 2-80) (105 × 12-635) △ 25 864 △ [(27-23) × 12] (45 + 38-16) × 24 500 - (240 + 38 × 6) [64 - (87-42)] × 15 (845-15 × 3) △ 1612 × [(49

Primary school mathematics problems (plus formula, unit)
1、 A highway has been built for 8 / 2km, accounting for 1 / 16 of the total length of the highway. How many meters is the total length of the highway?
2、 There are 10% 9kg monosodium glutamate in a bag of 50g. How many bags can you hold?
3、 Xiaoming made 24 red flowers, which is exactly 4 / 5 of Xiaohua's. how many red flowers did Xiaoming make less than Xiaohua?
4、 There are 56 people in the first class, recycling 2 / 1t of waste newspapers. There are 54 people in the second class, recycling 5 / 4T of waste newspapers. How many kg of waste newspapers are recycled per person in two classes?
(formula, unit!)

1.2/8km*16=4km=4000m
2.0.9kg = 900g, 900 / 50 = 18 bags
3.24 * (5 / 4) = 30, 30-24 = 6
4.1 class: 1 / 2T = 500kg, 500 / 56 is about 8.9kg
Class 2: 4 / 5t = 800kg, 800 / 54 is about 14.8kg

Primary school mathematics problems (with formula, unit relation)
1、 Xiaoming deposits 300 yuan in the bank and withdraws it as a whole for five years, with an annual interest rate of 5.66%. The interest tax on the deposit interest stipulated by the state should be paid at the rate of 20%. When it matures, how much is Xiaoming's after tax interest? How much is the total of principal and after tax interest?
2、 On January 4, 2007, Xiaohong made a current deposit of 200 yuan in the Bank village. If the annual interest rate is 1.52%, how many yuan are the principal and interest of Xiaohong after half a year?
3、 The consumption tax that a distillery should pay accounts for 45% of its turnover. In the first half of this year, the distillery paid a total of 225000 yuan of consumption tax. What is the sales rate of the distillery in the first half of this year?
4、 The turnover of a hotel in October is 250000 yuan, and that in November is 280000 yuan. If the business tax is paid according to 5% of the turnover, how much will the hotel pay in two months?

1： 5.66 × 300 △ 100 = 16.98 yuan, 16.98 × 5 = 84.9 yuan, 84.9 × 0.2 = 16.98 yuan, 84.9-16.98 = 67.92 yuan, 300 + 67.92 = 367.92 yuan, 2: 200 × 1.52 △ 100 = 3.04 yuan, 3.04 △ 2 = 1.52 yuan, 1.52 + 200 = 201.52 yuan, 3: X × 0.45 = 225000 yuan, x = 22.5 △ 0.45 = 500000 yuan, 4: 250000