Toán Lớp 6: tìm x F)5.x+3.(10-x)+x=45 g)336+x+64+2.x=100

Question

Toán Lớp 6:  tìm x  F)5.x+3.(10-x)+x=45 g)336+x+64+2.x=100

bichhhathu · Answer

f)   5x+3(10-x)+x=45    to 5x+30-3x+x=45    to (5x-3x+x)+30=45    to 3x+30=45    to 3x=45-30    to 3x=15    to x=15:3    to x=5   Vậy x=5   g)   336+x+64+2x=100    to (x+2x)+(336+64)=100    to 3x+400=100    to 3x=100-400    to 3x=-300    to x=-300:3    to x=-100   Vậy x=-100

truongankimtrong · Answer

f,  5.x + 3.( 10 - x ) + x = 45   &rArr;  5x + 30 - 3x + x      = 45   &rArr;  ( 5x - 3x + x ) + 30  = 45   &rArr;           3x + 30           = 45   &rArr;                3x              = 45 - 30   &rArr;                3x              = 15   &rArr;                 x               = 5        Vậy x = 5   g,   336 + x + 64 + 2x = 100   &rArr;           400 + 3x        = 100   &rArr;               3x               = -300   &rArr;                x                = -100           Vậy x = - 100   Phần g nếu bạn chưa học số &acirc;m th&igrave; x &isin; &empty; nh&eacute; !!!   Nếu c&oacute; g&igrave; th&igrave; bạn bảo lại mk