Реши уравнения. 90 - ( 7 * х + 19 ) = 36 56 / х + 12 * 3 = 44. Created by minecraftediton. matematika-ru

х + 12 * 3 = 44...

galinalyubezny 90-7х-19=36 56:х+36=44
7х=90-19-36 56:х=44-36
7х=35 56:х=8
х=5 х=7

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igo0770 1) 90 - ( 7 * х + 19 ) = 36
90-36=7*х+19
54-19=7*х
7*х=35
х=35:7=5
х=5

2) 56 / х + 12 * 3 = 44
56/х+36=44
56/х=44-36
56/х=8
множим правую и левую стороні уравнения на х, получаем:
56=8*х
8х=56
х=56:8=7
х=7

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