Update textbook.fr.md

00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/10.n1/12.en/textbook.fr.md

@@ -27,7 +27,7 @@ Feel free to create a new classification if necessary.
 - *Whole numbers, positive and negative*
 - *Real numbers*
 - *The four operations: $`+, -, ×, ÷`$*   
-  and therefore the sign $ `=` $
+  and therefore the sign $`=`$
 - *Power of 10 $`(10^p)`$*, power *of any integer n $`(n^p)`$*
 - *$`n^p \times n^q = n^{\,p + q}`$*
 
@@ -37,7 +37,7 @@ RESPOND:
 --------------------
 (CME-FR) _Good mastery, with exercises to develop automatisms:_
 
- - The *fractions* (related to the Pythagorean theorem in the right triangle, and the rule of three 3)
+ - The *fractions* (related to the Pythagorean theorem in the right-angled triangle, and the cross-multiplication's rule)
 
 RESPOND:
 (XXX-YY) ...
@@ -108,7 +108,7 @@ RESPOND:
 !
 
 (CME-FR) _Good mastery, with exercises to develop automatisms:_
-* *Pytahgore's theorem / rule of three* (in relation to fractions and the right triangle)
+* *Pytahgore's theorem / the cross-multiplication's rule* (in relation to fractions and the right-angled triangle)
 
 RESPOND:
 ... (XXX-YY)