Question

1/7+2/5-3/4 for class 8 chapter 1 rational numbers homework

Answer 1

Answer:

-29/140

Step-by-step explanation:

= 1/7+2/5-3/4

LCM of 7, 5, 4 = 140

= 1×20/7×20 + 2×28/5×28 - 3×35/4×35

= (20 + 56 - 105)/140

= (76 - 105)/140

= -29/140

Answer 2

Step-by-step explanation:

$\tt{} \frac{1}{7} + \frac{2}{5} - \frac{3}{4}$

$\tt{} \frac{1 \times 20}{7 \times 20} + \frac{2 \times 28}{5 \times 28} - \frac{3 \times 35}{4 \times 35}$

$\tt{} \frac{20}{140} + \frac{56}{ 140} - \frac{105}{140}$

$\tt{} \frac{20 + 56 - 105}{140}$

$\tt{} \frac{ - 29}{140}$

$\tt{} - \frac{29}{140}$

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