alculate: Câu 2:If you walk 45 minutes at a rate 4km/h and then run for 30 minutes at a rate of 10km/h, how many kilometers will you have gone at the end of one hour and 15 minutes?Answer: km. Câu 3:What is the maximum possible area, in , of a rectangle with a perimeter of 20cm?Answer: . Câu 4:Fill the missing number in the blank: Câu 5:In a magic triangle, each of the six whole numbers 10; 11; 12; 13; 14; 15 is placed in one of the circles so that the sum, S, of the three numbers on each side of...
Đọc tiếp
alculate:
(1-\frac{1}{3})(1-\frac{1}{4})\ldots(1-\frac{1}{10})(1-\frac{1}{11})]=$)
Câu 2:If you walk 45 minutes at a rate 4km/h and then run for 30 minutes at a rate of 10km/h, how many kilometers will you have gone at the end of one hour and 15 minutes?
Answer: km.
Câu 3:What is the maximum possible area, in
, of a rectangle with a perimeter of 20cm?
Answer:
.
Câu 4:Fill the missing number in the blank:
(3x+10)$)
Câu 5:In a magic triangle, each of the six whole numbers 10; 11; 12; 13; 14; 15 is placed in one of the circles so that the sum, S, of the three numbers on each side of the triangle is the same. The largest possible value for S is
Câu 6:Find the highest common factor of 147x and 98y if HCF(x;y)=1.
Answer:
Câu 7:Let
(x+b)$)
. Find the value of
.
Answer:
Câu 8:In triangle ABC, the measure of angle B is
less than 1.5 times the measure of angle A and the measure of angle C is
less than 2.5 times the measure of angle A. What is the measure of angle A in degrees?
Answer: The measure of angle A is
.
Câu 9:Write the next number in the sequence: 8; 24; 72;
Câu 10:Complete:
^2$)
Giúp mik với, có lời giải chi tiết nha. Thanks cả nhà =))))
75
Để tui dịch bài này cho :
Trong tam giác ABC, số đo góc B nhỏ hơn 1.5 lần số đo góc A là
và số đo góc C nhỏ hơn 2.5 lần số đo góc A là 
. Tính số đo góc A
Cách làm:
Đặt số đo góc A là x có:
x + (1.5x - 5) + (2.5x - 5) = 180
5x - 10 = 180
5(x - 2) = 180
x - 2 = 36
x = 38
Vậy góc A = 38 độ