1、(1)s22s ( )(2)含有未知数的算式就是方程。(3)tt2t ( )(4)x4是方程7x1018的解。4.6x6.8 x1.65.8 x0.37.3x0.19.1 6.7x34.17 6.7x0.546.47.4x52244 6.7x24512 x15.835x4x234 26(x1)156 0.4x5.5(1)d22c ( )(2)含有未知数的等式就是方程。(3)cc2c ( )(4)x6是方程7x1032的解。4x6 x98.2 x2.66.5x2.59.9 7.9x71.89 5.6x9.424.24.5x48222 6.8x18186 x0.88.274x76x300 49(x
2、9)784 4.5x5.6(3)aa2a ( )(4)x9是方程9x675的解。4.1x6.5 x5.72.7 x2.99.2x0.57.2 9.5x85.5 5.1x441.96.7x75528 9.2x39789 x0.3910x71x567 88(x7)880 3.3x6(1)a2=2a ( )(3)ss2s ( )(4)x6是方程7x834的解。3.4x5.2 x7.49.9 x1.87x29.7 6.2x27.9 4.7x5.617.96.3x43398 8.1x55431 x1738x23x61 20(x5)260 1.8x7.2(1)m22m ( )(3)yy2y ( )(4)x
3、4是方程6x222的解。2.8x6.7 x6.65.9 x0.26.53.49.7 3.4x1.02 5x1.943.14x3090 8.8x46658 x0.67.456x84x140 57(x4)684 2.4x8.2(1)a22b ( )(2)含有x的等式就是方程。(4)x5是方程9x1035的解。4.9x5.3 x9.20.7 x3.863.46.1 1.2x5.52 5.5x9.312.76.1x55433 6.2x78108 x2.17.348x74x244 28(x9)448 3.9x8.9(1)t22t ( )(2)含有未知数y的式子就是方程。(4)x9是方程6x648的解。0
4、.6x6.8 x41.1 x1.69.1x3.16.7 7.3x43.07 9x6.520.57.1x72567 7.2x81567 x3.57.583x61x144 56(x3)280 4.9x6.7(1)d2=2d ( )(3)mm2m ( )(4)x7是方程7x643的解。2.5x6.5 x9.97.1 x0.68.3x1.18.7 8.4x39.48 9.6x8.268.64.3x94293 6.3x47520 x4.98.477x71x296 73(x6)511 0.7x7.9(1)t22y ( )(3)3x33(x1) ( )(4)x5是方程3x69的解。4.8x7.5 x9.91.1 x3.18.3x4.75.7 0.6x3.96 7.8x0.753.98.7x29406 9.4x97373 x0.56.378x54x1056 80(x3)880 2.8x8.6(1)n2=2n ( )(3)bb2b ( )(4)x8是方程9x1062的解。2.8x8.2 x8.94.9 x1.18.1x17.8 6.2x20.46 4.7x5.813