1、(2)含有未知数的式子就是方程。(3)9n99(n1) ( )(4)x4是方程9x531的解。2.3x7.4 x7.82.8 x3.95.3x0.67.1 6.9x30.36 5.7x0.222.64.1x75212 6.3x23292 x1.29.888x44x1188 46(x5)460 1.6x8.7(1)b2=2b ( )(2)含有未知数x的式子就是方程。(3)bb2b ( )(4)x4是方程8x824的解。4.5x9.9 x8.89 x1.87.3x4.69.2 9.8x53.9 8.1x5.418.97.1x15269 8.7x30318 x2.66.860x46x424 89(x
2、6)979 4.1x7.6(1)c22x ( )(2)含有未知数的算式就是方程。(3)dd2d ( )(4)x9是方程4x531的解。2.4x5.1 x1.63.4 x49.1x17.5 3.1x9.3 8.4x5.153.76.6x12252 5.9x96435 x3.25.841x59x300 10(x3)100 0.3x6.1(1)a2(2)含有y的式子就是方程。(3)7y77(y1) ( )(4)x5是方程6x525的解。4.2x7.8 x7.91.6 x0.88.4x3.45.7 6.4x62.72 8.2x4.120.55x77173 5.5x8283 x4.85.522x45x1
3、34 33(x8)429 1.3x8.5(1)m2(2)含有y的等式就是方程。(3)tt2t ( )(4)x6是方程9x846的解。2.5x8.9 x83.6 x2.17.2x2.86.3 0.7x2.17 6.2x1.754.16.3x99216 8.6x41303 x3.67.846x73x119 43(x5)258 3.5x9.8(1)n22n ( )(2)含有未知数y的等式就是方程。(3)3a33(a1) ( )(4)x6是方程6x1026的解。3.6x9.7 x9.45.7 x4.27.2x48.9 7x61.6 7.2x424.88.4x47709 4.5x68157 x1.86.
4、928x22x350 82(x6)1230 2.3x8.2(1)n2=2n ( )(4)x8是方程7x848的解。1.2x6.4 x78.7 x3.68.3x17.5 5.1x21.93 4.9x2.641.55.3x29448 8.8x18422 x3.86.542x51x558 37(x6)259 3.4x6.5(1)b2(3)5b55(b1) ( )(4)x8是方程8x955的解。3x9.8 x1.73.2 x2.58.2x3.47.7 3x6.6 5.2x96.66.3x34155 8x64256 x2.49.823x12x315 78(x3)780 4.6x5.5(3)ss2s (
5、)(4)x8是方程6x741的解。2.1x7.1 x4.79.4 x3.17.21.97.6 9.2x74.52 9.8x3.925.57.3x63229 4.6x83285 x4.8997x46x286 66(x5)396 0.2x7.6(1)d22d ( )(3)4x44(x1) ( )(4)x8是方程6x345的解。0.5x8.3 x5.13.7 x3.66.21.58.1 9.3x5.58 7.6x5.325.15x85315 7.3x72439 x4.25.837x13x400 82(x1)574 2.3x7(4)x8是方程8x955的解。1.6x9.9 x4.90.5 x46.2x1.37.2 6.3x39.69 8x2.553.57.1x60153 4.4x5181 x4.76.231x96x254 70(x5)700 0.9x7(1)d2=2d ( )(3)nn2n ( )(4)x4是方程9x927的解。0.4x9.4 x0.53.3 x16x1.58.6 3.6x20.88 5.4x6.331.54.5x19341 4.2x24270 x2.66.842x51x558 35(x9)560 2.6x8.9
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