(1)70%X+(30-X)x55%=30x65%;==> 0.7x + 16.5 - 0.55x = 19.5==> 0.15x = 3==> x = 200(2)X/2-5X+11/6=1+2X-4/3.==> x/2 - 5x - 2x = 1 - 4/3 - 11/6==> x/2 - 7x = - (1/3 + 11/6)==> -13x/2 = - 13/6==> x =...
解下列方程:(1)70%X+(30-X)x55%=30x65%;(2)X/2-5X+11/6=1+2X-4/3.
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