Simplify the sign of the following numbers - (+ 6) = - (- 1.3) = - [+ (- 3)] = | - 5 | = - | - 2 and 1 / 3 | = | - 2.31 | = | + π|=

Simplify the sign of the following numbers - (+ 6) = - (- 1.3) = - [+ (- 3)] = | - 5 | = - | - 2 and 1 / 3 | = | - 2.31 | = | + π|=

-6,1.3,3,5,2 and 1 / 3,2.31, Pai

1 * 3:2 + 3 * 5:2 + 5 * 7:2 + 7 * 9:2 + 9 * 11:2 + 11 * 13:2, how to calculate? Urgent
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2/(1×3)＋2/(3×5)＋2/(5×7)＋2/(7×9)＋2/(9×11)＋2/(11×13)
＝2/3＋(1/3－1/5)＋(1/5－1/7)＋(1/7－1/9)＋(1/9－1/11)＋(1/11－1/13)
＝2/3＋1/3－1/5＋1/5－1/7＋1/7－1/9＋1/9－1/11＋1/11－1/13
＝1－1/13
＝12/13

Simple calculation of 1 / 5 (2 / 3 + 1 / 5) × 15

1 / 5 ÷ (2 / 3 + 1 / 5) × 15
=(1/5x15)÷(10/15+3/15)
=3÷13/15
=45/13
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[simple calculation] 1 / 15 × 3.5 + 4 / 15 × 3.5

1 / 15 × 3.5 + 4 / 15 × 3.5
=(1 / 15 + 4 / 15) × 3.5
=1 / 3 × 7 / 2
=7 out of 6

8 and 1 / 5 * 15

8 and 1 / 5 * 15
=(8+1/5)×15
=8×15+(1/5)×15
=120+3
=123;
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7 / 12 × 6 + 5 / 12 × 6. It can be easily calculated

7 / 12 × 6 + 5 / 12 × 6
=6/12x7+6/12x5
=6/12x(7+5)
=6/12x12
=6

A simple calculation of 2.7% 3 + 3.9% 5-3.7% 3 + 1.9% 4 + 1.7% 4

2 and 7:3 + 3 and 9:5-3 and 7:3 + 1 and 9:4 + 1 and 7:4
=2 and 7 / 3-3 and 7 / 3 + 1 and 7 / 4 + 3 and 9 / 5 + 1 and 9 / 4
=8/7+5
=Six and one in seven

How to calculate 7 / 9 × (1 △ 4 / 5-4 / 5) + 1 / 4

How to calculate 7 / 9 × (1 △ 4 / 5-4 / 5) + 1 / 4
The results are as follows
7/9*(5/4-4/5)+4
==7/9*9/20+4
==7/20+4
==4 and 7 / 20

5:1 * 13:2 + 5:2 * 13:12

1 / 5 * 2 / 13 + 2 / 5 * 12 / 13
=2/5×1/13+2/5×12/13
=2/5×（1/13+12/13）
=2/5×1
=2/5

(5 / 6 + 2 / 13) × 1 / 2-5 / 12

=（5/6+2/13）*0.5-5/12
=（130/156+24/156）*0.5-65/156
= 154/156*0.5-65/156
= 77/156-65/156
= 12/156
= 1/13