%@Dif:3
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Pour chacun des calculs ci-dessous, construis un schéma de calculs lui
correspondant. Ensuite à l'aide de ce schéma, effectue les calculs.
\[A=\frac12+\frac34\times\frac45\kern1cm
B=\left(\frac12+\frac34\right)\times\frac45\kern1cm
C=\frac12\times\frac34+\frac45\kern1cm D=\frac12\times\left(\frac34+\frac45\right)\]
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