En espérant pouvoir t'aider :
m) 19/8 × 4/38
= 19×4 / 8×38
= 76/304 = 1/4 (=0,25)
n) 125/36 × 9/25
= 125×9 / 36×25
= 1125/900 = 5/4 (=1,25)
p) 19/8 ÷ 4/38
= 19/8 × 38/4
=19×38 / 8×4
= 722/32 = 361/16
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En espérant pouvoir t'aider :
m) 19/8 × 4/38
= 19×4 / 8×38
= 76/304 = 1/4 (=0,25)
n) 125/36 × 9/25
= 125×9 / 36×25
= 1125/900 = 5/4 (=1,25)
p) 19/8 ÷ 4/38
= 19/8 × 38/4
=19×38 / 8×4
= 722/32 = 361/16