Question

Află numărul necunoscut a×3 = 27,4×a=36,a:3=7, a:4=7,32:a=4,12:a=3​

Answer 1

Răspuns:

3a=27=>a=27:3=>a=9

4a=36=>a=36:4=>a=9

a:3=7=>a=3·7=>a=21

a:4=7=>a=4·7=>a=28

32:a=4=>a=32:4=>a=8

12:a=3=>a=12:3=>a=4

Answer 2

$a\cdot 3=27 \\ \Rightarrow a=\frac{27}{3}=\boxed{9}; \\\\ 4\cdot a=36 \\ \Rightarrow a=\frac{36}{4}=\boxed{9}; \\\\\ a:3=7 \\ \Rightarrowa=7\cdot3=\boxed{21}; \\\\ a:4=7 \\ \Rightarrow a=7\cdot4=\boxed{28}; \\ \\ 32:a=4 \\ \Rightarrow a=\frac{32}{4}=\boxed{8}; \\ \\ 12:a=3 \\ \Rightarrow a=\frac{12}{3}=\boxed{4}.$