stl je n arive pas à fair c calcul de math en 4em

a. 7-(-3,5+(5-4+3)
b. -5×(-4,7+2)-(8,1+2)×(-1)
c. -2 (-7+2×(-3 ))
--------------------
-4+7×2
b. -1×(2×(-3,2+4×(-5)+6)-7)+8,9
c. 7-3×(-8)+5
d. -1+12×(-0,5)×(-8)​
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