若m=4x²-6x+3,n=5x²-3x+4,则9x²-9x+7等于( )
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9x²-9x+7=(4x²-6x+3)+(5x²-3x+4)=m+n
选A
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解方程: 9x/0.7=9; 25-3x=19; 4(x-9)=4; x-18=4=8; 5.6x-4.5/3=5.5;
解方程:9x/0.7=9; 25-3x=19; 4(x-9)=4; x-18=4=8; 5.6x-4.5/3=5.5;