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Non application questions on prime numbers Fill in the appropriate prime number in the brackets to make the formula true! 98=(）X（）x（） 100＝（）x（）x（）x（）x（） 110＝（）x（）x（） 112＝（）x（）x（）x（）x（） 114＝（）x（）x（）x（）
98=2*7*7
100=2*2*5*5
110=2*5*11
112=2*2*2*2*14
114=2*3*19
Some of the questions are wrong
Solution ratio: 4: x = 2.1:3 X: 13 / 6 = 3.25:3.5 (6 + x): 5 = 14:7 application question: how many kilograms of sugar and water do you need to prepare 500 kilograms of sugar water with the mass ratio of 1:9?
Practical questions: (9 + 1) / 500 = 50 (kg)
Sugar: 50 * 1 = 50 (kg)
Water: 50 * 9 = 450 (kg)
Solution ratio:
If the fixed line telephone charges 24 yuan for the landline first, and then the call fee is charged according to a certain standard time, then the monthly call fee and call time ()
A. In proportion B. in inverse proportion C. out of proportion
I think it's a, but the answer is C. why?
If you don't charge 24 yuan, it's a positive proportion
And the monthly telephone charge = call time × charge per minute + 24 yuan landline charge
Therefore, the monthly telephone fee is not proportional to the call time
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