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17/77X10+17/77X9+17/77X8+17/77X7+17/77X7+17/77X6+1...

17 / 77 * 10 + 17 / 77 * 9 + 17 / 77 * 8 + …… 17 / 77 * 1= 17 / 77 * (10 + 9 + 8 + 7 + 6 …… + 2 + 1)= 17 / 77 * (1 + 10)* 10 ÷ 2= 17 / 77 * 11 * 5= 17 ÷ 11 ÷ 7 * 11 * 5= 17 ÷ 7 * 5= 85 / 7

原式=17/77*(10+9+8+7+6..+2+1) =17/77*(10+1)*10*1/2 =17/77*55 =935/77

99*7+77*9+33*18 =99*(7+7+6) =99*20 =1980 你好,本题已解答,如果满意 请点右下角“采纳答案”.

557254

99x7+77x9+33x18=99*7+99*7+33*3*6=99*(7+7+6)=99*20=1980

=(10+9+8+7+……+1)*17/77=55*17/77=85/7

不知道,1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

加到哪呀一吗(17/77)*(10+9+8+7+6+5+4+3+2+1)=(17*55)/77=85/7

17/8*9/2+17/8*9/8=17/2*9/8+17/8*9/8=(17/2+17/8)*9/8=85/8*9/8=765/64

(1)x^2-9x+8=0 答案:x1=8 x2=1 %D%A(2)x^2+6x-27=0 答案:x1=3 x2=-9 %D%A(3)x^2-2x-80=0 答案:x1=-8 x2=10 %D%A(4)x^2+10x-200=0 答案:x1=-20 x2=10 %D%A(5)x^2-20x+96=0 答案:x1=12 x2=8 %D%A(6)x^2+23x+76=0 答案:x1=-

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