1Ass

INVESTISSEMENT: Exercice 1 $$ \begin{aligned} & A=36+24-52+3 \\ & A=60-52+3 \\ & A=8+3 \\ & A=11 \\ & B=3,5-2,5+14,3-5 \\ & B=1+14,3-5 \\ & B=15,3-5 \\ & B=10,3 \\ & C=4,8+6-7,6-1,2 \\ & C=10,8-7,6-1,2 \\ & C=3,2-1,2 \\ & C=2 \end{aligned} $$ Exercice 2 $$ \begin{aligned} & A=36-(6+10)-12 \\ & A=36-16-12 \\ & A=20-12 \\ & A=8 \\ & B=(43-6)-(5+23) \\ & B=37-28 \\ & B=9 \\ & C=12+(12-8)+6 \\ & C=19+4+6 \\ & C=29 \end{aligned} $$ Exercice 3 $$ \begin{aligned} & A=15: 5-4+12 \\ & A=3-4+12 \\ & A=-1+12 \\ & A=11 \\ & B=19+12 \times 3-24 \\ & B=19+36-24 \\ & B=55-24 \\ & B=31 \\ & C=38-5 \times 1,4-1 \\ & C=38-7-1 \\ & C=30 \end{aligned} $$ Exerlice 4 $$ \begin{aligned} & A=2,1 \times(12-(4+3)) \\ & A=2,1 \times(12-7) \\ & A=2,1 \times(5 \\ & A=7,1 \\ & B=[28-(6+4)) \cdot 6 \\ & B=[28-10]: 6 \\ & B=18: 6 \\ & B=3 \\ & C=56,3-3 \times 2,5+7 \times 4 \\ & C=56,3-7,5+28 \\ & C=20,8 \end{aligned} $$ Exercice 5 $$ \begin{aligned} & A=38-7 \times 5 \cdot 18: 9 \\ & A=38-35-2 \\ & A=3-2 \\ & A=1 \\ & B=74-(9-7)+(8-3,5 \times 2) \\ & B=74-2+(8-7) \\ & B=74-2+1 \\ & B=73+1=74 \\ & C=[4 \times 8-(15-8)] \times 3+[(7 \times 2)+2]-10 \\ & C=[32-7] \times 3+[14+2]-10 \\ & C=\{ \\ & C=25=75+6 \\ & C=81 \end{aligned} $$ ExerciG 6 $$ \begin{aligned} & A=[1-(0,25 \times 4)] \times 4 \\ & A=[1-1] \times 4 \\ & A=0 \times 4 \\ & A \leq 0 \\ & B=1+[3 \times(6+(3 \times 8))] \\ & B=1+[3 \times(6+24)] \\ & B=1+[3 \times 30) \\ & B=1+90 \\ & B=91 \\ & C=[(1+3) \times 6)]-3(3 \times 8) \\ & c=[4 \times 6]-3 \times 24 \\ & c=24-3 \times 24 \\ & c=24 \times(1-3) \\ & c=24 x-2 \\ & c=-48 \\ & D=(5+3,2)-(1+6,3) \\ & D=8,2-7,3 \\ & D=0,1 \\ & \end{aligned} $$ Exorcice 7 $$ \begin{aligned} 3+4 \times 2 & =14 \\ (3+4) \times 2 & =7 \times 2 \\ & =14 \end{aligned} $$ $$ \begin{aligned} 11+3 \times 7 & =32 \\ 11+(3 \times 7) & =11+21 \\ & =32 \end{aligned} $$ $$ 2 \times 7-2+2=12 $$ $$ \begin{aligned} 2 \times(7-2)+2 & =2 \times 5+2 \\ & =10+2 \\ & =12 \end{aligned} $$ $$ \begin{aligned} 1,2 \times 5+2 & =8 \\ (1,2 \times 5)+2 & =6+2 \\ & =8 \end{aligned} $$ \begin{aligned} & \text { Exercice } 9 \\ & \text { Aire }=(16 \times 6)-(6-4) \times(16-10) \\ & \text { Aire }=96-2 \times 6 \\ & \text { Aire }=96-12 \\ & \text { Aire }=84 \\ & \text { Périmetre }=6+10+(6-4)+(16-10)+4+16 \\ & \text { Perivetre }=16+2+6+20 \\ & \text { Perimetre }=44 \end{aligned} Exercice 8 $$ e=50-3 \times 9,2-13,8 $$ \begin{aligned} & \text { Exercice } 9 \\ & \text { Aire }=(16 \times 6)-(6-4) \times(16-10) \\ & \text { Aire }=96-2 \times 6 \\ & \text { Aire }=96-12 \\ & \text { Aire }=84 \\ & \text { Périmetre }=6+10+(6-4)+(16-10)+4+16 \\ & \text { Perivetre }=16+2+6+20 \\ & \text { Perimetre }=44 \end{aligned} Exercice 10 $$ \begin{aligned} & \text { a) } 4 \times x-8=4 x-8 \\ & a \times(b+4)=a(b+4) \\ & 5,4 \times a=5,4 a \\ & a \times 3=3 a \\ & (4-x) \times(3+y)=(4-x)(3+y) \\ & 2 \times \pi \times R=2 \pi R \end{aligned} $$ 2) par ce que le signe de multiplication est entre deur nombre. $$ \begin{aligned} y & =6 \times 3 a \\ & =18 a \end{aligned} $$