เรียนห้อง E.P. ก่อนเปิดเทอมมาฝึกโจทย์ Math Grade9 กัน

โจทย์วิชา Math Grade9 

Linear Inequalities in One Variable

Translate the following sentences to mathematical sentences.

• Three times a number is less than nine.

Answer : 3x < 9

• A number subtracted by seven is greater than twenty.

Answer : x - 7 > 20

• The sum of four times a number and eleven is less than or equal to fifteen.

Answer : 4x + 11 ≤ 15

• Two times a number subtracted by twenty-two is greater than or equal to ten.

Answer : 2x - 22 ≥ 10

• Two times the sum of a number and three is not equal to eight.

Answer : 2(x + 3) ≠ 8

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• Seven times the difference between a number and sixteen is not more than four.

Answer : 7(x - 16) ≤ 4

• The sum of one fifth of a number and eighty is not less than six.

Answer :  1/5x + 80 ≥ 6

• The product of a number and seven, when added by three, is at most eighteen.

Answer : 7x + 3 ≤ 18

• The sum of a number and two, when divided by eight, is not more than thirty-one.

Answer : (x + 2)/8 ≤ 31

• Four-fifths of the sum of a number and three is less than half of that number.

Answer : 4/5(x + 3) < 1/2x