bonjour
a) 9/24 = 3 /8
26/169 = 2/13
- 32/- 72 = 4/9
b) 4 x 10² + 5 x 7² - 3.5
= 400 + 245 - 3.5
=641.5
( 6 - 3 x 5 )² + 2 x 0.4 ²
= ( 6 - 15 )² + 2 x 0.16
= ( - 9 )² + 0.32
= 81 + 0.32 = 81.32
c) A + B = 4/5 - 2/3 = 12/15 - 10/15 = 2/15
ABC = 4/5 * - 2/3 * 7/6 = - 56/90 = - 28/ 45
A + (B + C )
= 4/5 + ( - 2/3 + 7/6 )
= 4/5 + ( - 4/6 + 7/6 )
= 4/5 + 3/6
= 24/30 + 15/30
= 39/30 = 13/10
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bonjour
a) 9/24 = 3 /8
26/169 = 2/13
- 32/- 72 = 4/9
b) 4 x 10² + 5 x 7² - 3.5
= 400 + 245 - 3.5
=641.5
( 6 - 3 x 5 )² + 2 x 0.4 ²
= ( 6 - 15 )² + 2 x 0.16
= ( - 9 )² + 0.32
= 81 + 0.32 = 81.32
c) A + B = 4/5 - 2/3 = 12/15 - 10/15 = 2/15
ABC = 4/5 * - 2/3 * 7/6 = - 56/90 = - 28/ 45
A + (B + C )
= 4/5 + ( - 2/3 + 7/6 )
= 4/5 + ( - 4/6 + 7/6 )
= 4/5 + 3/6
= 24/30 + 15/30
= 39/30 = 13/10