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Unit 3 inspection
You can go to the website of some publishing houses or others. But you'd better write it yourself. You can't ask the teacher. Mathematics is very important
Given that the absolute value of A-3 and the positive square root of B + 1 are opposite numbers, find the square root of a + B,
±√2
|A-3 | + √ B + 1 = 0
So A-3 = 0, a = 3
b+1 ＝0,b＝－1
So a + B = 2
So ± √ a + B = ± √ 2
Mathematics problems about time in grade three of primary school
I only offer five courses
1. How many days in a year? How many weeks and days?
2. When Xiaoqiang was 12 years old, he only had one birthday. When was Xiaoqiang born?
3. Zhang Hua turns 10 years old in May. Which year was he born?
4. The people's Republic of China was founded on October 1, 1949. How many years will it be until October 1 this year?
5. The train starts from Beijing at 2:40 p.m. and arrives at Shijiazhuang at 17:45 p.m. how long does it take from Beijing to Shijiazhuang?
As shown in the figure, in ▱ ABCD, e is the midpoint of CD, AE and BD intersect at O, s △ DOE = 12cm2, then s △ AOB is equal to ()
A. 24 cm2B. 36 cm2C. 48 cm2D. 60 cm2
∵ in ▱ ABCD, e is the midpoint of CD, ∵ AB = CD = 2DE, and ∵ ab ∥ CD, ∵ AOB ∽ EOD, ∵ S & nbsp; △ AOBS & nbsp; DOE = (ABDE) & nbsp; 2 = 4, ∵ s △ AOB = 4S △ DOE = 48cm2
How many hectares and square meters is nine fifths of a hectare
1 ha = 10000 M2 9 / 5 ha = 1.8 ha = 1 ha 8000 M2
A train is 160 meters long. It takes 30 seconds for the whole train to pass the 440 meter bridge. How many meters does the train travel per second?
(440 + 160) △ 30 = 20m
So the train goes 20 meters per second
A rectangle is 5cm in length and 3cm in width. Rotate it around its width. The volume of the cylinder is () cm3
75π
Can the quadratic power of 762 × 17-235 × 17 be divisible by 100 or 1000?
762^2*17-235^2*17
=17*(762-235)*(762+235)
=17*527*997
So it's not divisible by 100 or 1000
The relationship between telephone charges and call time is shown in the following table: call time 1 minute 0.2 + 0.5 two minutes 0.4 + 0.5 three minutes 0.6 + 0.5 column equation!
1. When the call time is x, how much is the call fee y?
2. Calculate the telephone charge for 15 minutes
1.0.2x+0.5=y
2.3.5
As shown in the figure, in the quadrilateral ABCD, the diagonal AC and BD intersect with the point O. it is known that ∠ ABO + ∠ ADO = 90 ° to prove that the quadrilateral ABCD is cabinet type
As shown in the figure, in the parallelogram ABCD, the diagonal lines AC and BD intersect at the point O, and EF passes through the point O and AB, cdao = co respectively, so go = Ho, AOF and COE are congruent, and EO = fo is usually used, so ehfg is a parallelogram
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