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What is 1 / 2 - (- 1 / 3) - 7 / 4 + (- 5)?
1 / 2 - (- 1 / 3) - 7 / 4 + (- 5) is equal to
2 molecule 1 + 3 molecule 1 - (4 molecule 7 + 5)
It's 6 molecules, 5-4 molecules, 27
It's equal to - 12 molecules 71
What is 1 / 2 + (7 / 10-1 / 5) × 4 / 5
1 / 2 + (7 / 10-2 / 10) △ 4 / 5 = 1 / 2 + 5 / 10 * 5 / 4 = 1 / 2 + 5 / 8 = 4 / 8 + 5 / 8 = 9 / 8
A number plus its reciprocal equals four. What's the number?
Let this number be x, then x + 1 / x = 4
x*2-4x+1=0
X = 2 plus minus root 3
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