How to calculate 1.58 * 0.58 + 0.42 * 0.42 + 1.16 * 0.42 how to calculate 1.58 * 0.58 + 0.42 * 0.42 + 1.16 * 0.42

1.58*0.58+0.42*0.42+1.16*0.42
=1.58*0.58+0.42*（0.42+1.16）
=1.58*0.58+0.42*1.58
=1.58*（0.58+0.42）
=1.58*1
=1.58

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2. 1. A number 1 / 5 is 3 less than its 1 / 4. What's the number? 2. 2 / 3 of a number is equal to 5 / 7 of 4 / 9 3. 12 plus 2 / 5 of a number, and 30, find the number 4. What's the product of 2 / 3 plus 1 / 4 divided by 3 / 4? 5. The sum of the quotient of a number divided by 1 / 5 plus 1 / 2 is four and a half 6. The quotient of 7 / 13 divided by a number is equal to the product of 9 / 11 multiplied by 11 / 13 7. 1 / 3 times of a number is equal to 5 / 7 of 4 / 5 8. A number plus four is exactly equal to four times one and three fourths 9. A number minus 3 / 4 equals 2 / 3 of 1 / 2. What's the number? 10. How much less is 5 / 6 of 3 / 4 than 2? 11. 5 / 18 of a number is 20. What's 7 / 12 of this number? 12. 2 / 3 of a number is 60. What's 7 / 9 of this number? 13. 3 / 5 of a number is 48. What's 7 / 8 of this number? 14. 7 / 8 of 24 is 7 more than 2 / 7 of a number. What's the number? 15. 3 / 4 of a number is 12 more than 60. What's the number? 16. The number a is 36, and the number B is 4 / 9 of the number A. what is the sum of the two numbers a and B? 17. The ratio of a to B is 5:7. A is 30. What is B? 18. The ratio of a to B is 5:6. The sum of them is 66. What is the difference between them? 19. What is the quotient of 8 / 13 divided by 7, plus the product of 1 / 7 and 6 / 13? I'm sorry! But I hope you can answer enthusiastically! Because I'm really in a hurry! I have worked out questions 4, 10, 16, 17 and 19! You don't have to do these questions! In other words, you can do 5 less questions. (in order to avoid your confusion, I repeat that you don't have to do questions 4, 10, 16, 17 and 19! Do everything else) I've already reported all of you who won't answer well! Don't bother me!
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