Question

calculați numerele necunoscute știind ca: a) a:(24:4)=7 a:(2×2)=6 (a×8):6=4 b) 30:(6:a)=10 a:(25-21)=5 a:5×2=8 c)a×9:3=12 7×a-13=8 a:9×6=18

Answer 1

a)a:(24:4)=7 -    a:6=7 a=6x7 a=42                                                                                                                        a:(2x2)=6  -  a:4=6 a=4x6 a=24                                                                                                                            (ax8):6=4  - ax8=6x4 ax8=24 a=24:8 a=3                                                                                                                            b) 30:(6:a)=10  - 6:a=10x30 6:a=300 a=300:6 a=50                                                                                                                                  a:(25-21)=5  -a:4=5 a=4x5 a=20                                                                                                                                a:5x2=8  - a:10=8 a=8x10 a=80                                                                                                                             ax9:3=12  - ax3=12 a=12:3 a=4                                                                                                                             7xa-13=8  - a-13=8x7 a-13=56 a=56-13 a=43                                                                                                                            a:9x6=18  - a:54=18 a=54:18 a=3