=(2.5×0.04)×( 1.25×0.8)

=0. 1× 1

=0. 1

6×4-0.6x=6.36

Solution 0.6x=32-6.36

x=42.4

The area of triangle is equal to the area of square. The side length of a square is12cm, and the bottom of a triangle is18cm. What is its height?

12x 12/ 18 x2 = 16

When a number is expanded to 10 times, it is 45.54 times larger than the original number. How much is this number?

45.54/9=5.06

0.09× 16+0.8x= 132

Solution 0.8x= 132- 1.44

x= 163.2

A truck travels from city A to city B at a speed of 60 kilometers per hour. 1.5 hours later, a car drove from city a to city b at a speed of 90 kilometers per hour. A few hours later, the car overtook the truck. (solve by equation.

60x(x+ 1.5)=90x

x=3