本来1 就变2 然后 12变3 加1的变2 加2变3 这样
1x8+1 =9 12x8+2=98 123x8+3=987 9x9-1=80 98x9-2=880 987x8-3=8
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相关问题
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7/9x(-8/9)+2/9x(-8/9) 2/3x(-5/8)-(-1/3)x(-5/8) -9除以3+(1/2-2/
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(2007•中山区二模)观察下列各式:1×8+1=9,12×8+2=98,123×8+3=987,…,猜测1234567
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(1-1/2)x(2-2/3)x(3-3/4)x……x(8-8/9)x(9-9/10)
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)1+2+3……+100=7+8+9……+103=23+24+……+98=1X2/1 +2X3/1 +……+9X10/1
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几道简便计算题(1)9.81X0.1+0.5X98.1+0.049X981=(2)7.8÷[(9-8.98)X2.5}
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.2x(3x+1)=9x+3(x+8)(x+1)=12
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解方程x÷15=1.6 0.8x=1x+3.8=3.8x-[2/9]=[4/9].
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4x15/2= 12/5x8= 3/1x4/1= 9/8x10= 6x12/11= 9/2x5/3= 14/6x9/7=
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(2X+根号3)^9=a0X^9+a1X^8+.+a8X+a9
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2.1X+7.9X=6.9 5X+0.8×2=7.12X+5.8=8.2 6X-3×4=1.2