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2. Aflați numerele necunoscute din egalitățile de mai jos:
40: m + 4 = 12
(250 - a): 10 + 33 = 41
136 - nx 4 = 100
141 - 5 x (b - 3) = 101
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Răspuns :

Răspuns:

Explicație pas cu pas:

[tex]\bf 40: m + 4 = 12[/tex]

[tex]\bf 40: m = 12-4[/tex]

[tex]\bf 40: m = 8[/tex]

[tex]\bf 40 = 8\cdot m[/tex]

[tex]\bf 8\cdot m=40[/tex]

[tex]\bf m = 40 : 8[/tex]

[tex]\red{\underline{\bf m = 5}}[/tex]

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[tex]\bf (250 - a): 10 + 33 = 41[/tex]

[tex]\bf (250 - a): 10= 41-33[/tex]

[tex]\bf (250 - a): 10= 8~~~\bigg|\cdot 10[/tex]

[tex]\bf (250 - a)= 8\cdot 10[/tex]

[tex]\bf 250 - a= 80[/tex]

[tex]\bf 250 = 80+a[/tex]

[tex]\bf 250 -80=a[/tex]

[tex]\purple{\underline{\bf a=170}}[/tex]

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[tex]\bf 136 - n\cdot 4 = 100[/tex]

[tex]\bf 136 =100+ n\cdot 4[/tex]

[tex]\bf 136 -100= n\cdot 4[/tex]

[tex]\bf 36= n\cdot 4[/tex]

[tex]\bf n\cdot 4=36[/tex]

[tex]\bf n = 36:4[/tex]

[tex]\blue{\underline{\bf n = 9}}[/tex]

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[tex]\bf 141 - 5 \cdot (b - 3) = 101[/tex]

[tex]\bf 141 =101+ 5 \cdot (b - 3)[/tex]

[tex]\bf 141-101= 5 \cdot (b - 3)[/tex]

[tex]\bf 40= 5 \cdot (b - 3) ~~~\bigg|:5[/tex]

[tex]\bf 8= b - 3[/tex]

[tex]\bf b = 8+3\\[/tex]

[tex]\pink{\underline{\bf b=11}}[/tex]

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