NCERT Exercise 1.1 (Part 1)Question 1: Using appropriate properties find;(i) −23×35+52−35×16-23×35+52-35×16Solution: Given, −23×35+52−35×16-23×35+52-35×16=−23×35−35×16+52=-23×35-35×16+52(Using commutativity)...
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Question 3: Write five rational numbers which are smaller than 2. Solution:Some of the five rational numbers smaller than 2 can be written as follows: 1,1212, 0,−12-12,−1-1 Alternate method: Given number 2 can be written as6363 ...
excellup Class 7 Maths Integers NCERT Exercise 1.1Question 1: Following number line shows the temperature in degree celsius (°C) at different places on a particular day.Picture taken from NCERT BookObserve this number line and write the temperature of the places marked on it.Answer:Place...
3000 16 4000 12 5000 10 6000 8 7000 6 8000 4 9000 3 10000 1 Total 60Answer:Salary (in Rs.)(xi)No. of workers (fi)fixi 3000 16 48000 4000 12 48000 5000 10 50000 6000 8 48000 7000 6 42000 8000 4 32000 9000 3 27000 10000 1 10000 Total Σfi=60Σfi=60 Σfixi=305000Σfixi=30...
Question 4: Write the degree of each of the following polynomials:(i) 5x3+4x2+7x5x3+4x2+7xAnswer: Since, highest exponent of variable x = 3, thus degree of given polynomial = 3(ii) 4−y24-y2Answer: Since, highest exponent of variable y = 2, thus degree of given polynomial = 2...
And,β=3√β=3-132 Question (ii):1x+4−1x−7=1130x≠−4or71x+4-1x-7=1130x≠-4or7 Answer: 1x+4−1x−7=11301x+4-1x-7=1130 Or,x−7−x−4(x+4)(x−7)=1130x-7-x-4(x+4)(x-7)=1130 Or,x2−7x+4x−2830=−1x2-7x+4x-2830=-1 ...
Question 14: (a+4)(a+2)=a2+8(a+4)(a+2)=a2+8Answer: =a2+2a+4a+8=a2+6a+8=a2+2a+4a+8=a2+6a+8Question 15: (a–4)(a–2)=a2–8(a–4)(a–2)=a2–8Answer: a2–2a–4a+8a2–2a–4a+8=a2–6a+8=a2–6a+8Question 16: 3x2÷3x2=03x2÷3x2=0Answer: = 1...
Answer:23.6÷100=0.23623.6÷100=0.236 98.53 ÷100 Answer:98.53÷100=0.985398.53÷100=0.9853 Question 4:Find the value of following: 7.9 ÷ 1000 Answer:7.9÷1000=0.00797.9÷1000=0.0079 26.3 ÷ 1000 Answer:26.3÷1000=0.026326.3÷1000=0.0263 ...