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Đại số

Tìm giá trị của x biết rằng 12x + 83 = ...

Find the value of x given that 12x + 83 = (4x - 5) - (2x + 2). Tìm giá…

Khối 8

A train was running at the speed of 50km/h. A car was running at the speed of 60km/h in the…

Khối 8

Given that A : B = 4 : 3, B : C = 1 : 2 and A + B +…

Khối 8

John goes 9km west, then goes 12km south. How many km is he now from the start? John đi về…

Khối 8

A store sells $3 vanilla ice-creams and 5$ chocolate ice-creams. On a day, they sold 100 ice-creams in total and…

Khối 7

How many rectangles are there in the figure below? Hỏi có bao nhiêu hình chữ nhật trong hình dưới đây?…

Khối 7

How many 3-digit numbers divisible by 4 can be formed by using the digits 1, 2, 3, 4, 6 and…

Khối 7

Given 20 different points on a plane, no three of which are collinear. How many triangles whose vertices are the…

Khối 7

A box contains 100 marbles in 3 colors: red, blue and yellow. There are 20 red marbles and 44 blue…

Khối 7

How many ways are there to arrange 4 boys and 2 girls sitting in a row that two ends of…

Hình học

At least how many revolutions does the wheel need to rotate to cover a distance of 440m, given that its…

Hình học

Andy stacks some identical cubes with side length 2cm on top of each other to get the figure below. Find…