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2014-10-14T00:20:17+03:00
A)5x+13y+16z= 5x+5y+8y+16z= 5 (x+y)+8 (y+2z)= 5×8+8×35= 8× (5+35)= 8×40=320 b)7x+10y+6z= 7 (x+y)+3(y+2z)= 7×8+3×35= 56+105=161 c) x+20+2a=4b+74 X+20+2(a-2b)=74 x+20+2×7=74 x+20+14=74 x+20=74-14 x+20=60 x=60-20 x=40