Xiao Li's monthly food expenditure is 600 yuan. How much is Xiao Li's monthly total expenditure Support for the elderly 9%, other 10%, culture 20%, food 36%, shopping 2%, water and electricity 15%, health 8%

Xiao Li's monthly food expenditure is 600 yuan. How much is Xiao Li's monthly total expenditure Support for the elderly 9%, other 10%, culture 20%, food 36%, shopping 2%, water and electricity 15%, health 8%

600 × 9% = 54 yuan
600 × 10% = 60 yuan
600 × 20% = 120 yuan
600 × 36% = 216 yuan
600 × 2% = 12 yuan
600 × 15% = 90 yuan
600 × 8% = 48 yuan

The number of black rabbits in Xiaoli's family is three times that of white rabbits, and the number of white rabbits and black rabbits in Xiaoli's family is 14 less than that of black rabbits. How many white rabbits and black rabbits have been raised respectively? (use two methods to answer) who will? Please, thank you!

1：3=x：x+14
3x-x=14
x=7 3x=3x7=21
Let x rabbits be 3x-x = 14
x=7
21 black rabbits

A trapezoidal wheat field covers an area of 720 square centimeters, with an upper bottom of 23m and a lower bottom of 25m. How high is the wheat field

Let's start with the area formula of trapezoid
S ladder = (upper bottom + lower bottom) × height △ 2
Formula deformation
Height = area × 2 ^ (upper bottom + lower bottom)
have to
720 × 2 ÷ (23 + 25) = 30 unit: M
A