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Abdoul457
@Abdoul457
May 2019
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Utiliser les identités remarquables pour calculer mentalement. SVP JE COMPREND PAS
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trudelmichel
Verified answer
Bonjour,
a)
25²-15²
a²-b²=(a+b)(a-b)
25²-15²=(25+15)(25-15)
(40)(10)=400b)
b)
26x34
26=30-4
34=30+4
26x34)=(30+4)(30-4)
(a+b)(a-b)=a²-b²
(30+4)(30-4)=30²-4²
30²-4²=900-16
884
c)
201²-199²
a²-b²=(a+b)(a-b)
201²-199²=(201+199)(201-199)
(400)(2)=800
d)
102x98
102=100+2
98=100-2
102x98=(100+2)(100-2)
(a+b)(a-b)=a²-b²
(100+2)(100-2)=100²-2²
10000-4=9996
e)
48²-47²
a²-b²=(a+b)(a-b)
48²-47²=(48+47)(48-47)
95*1
95
f)
33x27
33=30+3
27=30+3
33x27=(30+3)(30-3)
(a+b)(a-b)=a²-b²
(30+3)(30-3)=30²-3²
900-9=891
g)
3.5²-0.5²
a²-b²=(a+b)(a-b)
3.5²-0.5²=(3.5+0.5)(3.5-0.5)
(4)(3)
12
h)
2.8x3.2
2.8=3-0.2
3.2=3+0.2
2.8x3.2=(3+0.2)(3-0.2)
(a+b)(a-b)=a²-b²
(3+0.2)(3-0.2)= 3²-0.2²
9-0.4=8.6
3 votes
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Lista de comentários
Verified answer
Bonjour,a)
25²-15²
a²-b²=(a+b)(a-b)
25²-15²=(25+15)(25-15)
(40)(10)=400b)
b)
26x34
26=30-4
34=30+4
26x34)=(30+4)(30-4)
(a+b)(a-b)=a²-b²
(30+4)(30-4)=30²-4²
30²-4²=900-16
884
c)
201²-199²
a²-b²=(a+b)(a-b)
201²-199²=(201+199)(201-199)
(400)(2)=800
d)
102x98
102=100+2
98=100-2
102x98=(100+2)(100-2)
(a+b)(a-b)=a²-b²
(100+2)(100-2)=100²-2²
10000-4=9996
e)
48²-47²
a²-b²=(a+b)(a-b)
48²-47²=(48+47)(48-47)
95*1
95
f)
33x27
33=30+3
27=30+3
33x27=(30+3)(30-3)
(a+b)(a-b)=a²-b²
(30+3)(30-3)=30²-3²
900-9=891
g)
3.5²-0.5²
a²-b²=(a+b)(a-b)
3.5²-0.5²=(3.5+0.5)(3.5-0.5)
(4)(3)
12
h)
2.8x3.2
2.8=3-0.2
3.2=3+0.2
2.8x3.2=(3+0.2)(3-0.2)
(a+b)(a-b)=a²-b²
(3+0.2)(3-0.2)= 3²-0.2²
9-0.4=8.6