解方程(五年级).doc

名师课堂——关键教方法——方老教你学数学小学四升五数学思维训练（解方程一）一个加数一个加数 = = 和和 - - 另一个加数；被减数另一个加数；被减数 = = 差差 + + 减数；减数减数；减数 = = 被减数被减数 - - 差；差； 一个因数一个因数 = = 积积 ÷÷另一个因数；被除数另一个因数；被除数 = = 商商 ××除数；除数除数；除数 = = 被除数被除数 ÷÷商 例例 1 1： 20 + x = 32 x – 12 = 20 90 - x = 108 x = 56 x ÷ 9 = 8 35 ÷ x = 7练习练习： x + 15 = 28 x – 25 = 30 20 – x =1012 ×x = 180 x ÷ 20 = 8 98 ÷ x = 14y – 21 = 14 a – 18 = 26 x ÷ 7 = 12例例 2 2： 20 + 5x = 40 4x – 1 = 15 80 - 4x = 56练习练习： 6 + 3x = 36 13x – 8 = 18 4x – 64 = 07x + 3×4 = 47 8×7 - 6x = 20 5x - 20÷4 = 156m = 42 3x + 6 = 15 0.5x – 2 = 24名师课堂——关键教方法——方老教你学数学例例 3 3： 5x + 9x = 56 72x – 2x = 630 12X – 9X = 0练习练习：2x + 8x = 100 2x – x = 65 21x - 18x = 3122x + 20 = 80 4x + 9 = 249 y + 3y = 456x – x = 125 3y – 6 = 48 m ÷ 0.6 = 4.53m + 2m = 65 6x – 3x = 4.8 5x – 3.9 = 5.1例例 4 4：3x ÷ 12 = 20 84 ÷ 2x = 21 5×（ x – 2 ）= 40练习练习：4x × 12 = 144 6x ÷ 24 = 3 20 ÷( 10 ÷ x ) = 436 ÷ 2x = 2 2×( x - 5 ) = 46 50 ÷（X + 1）= 2 名师课堂——关键教方法——方老教你学数学小学四升五数学思维训练（解方程二）1. .2 x＋2 = 23. .6 4. .2 = x÷12 36－4x = 83x－3.3 = 7.8 126÷x－26 = 16 x÷2－5 = 163×5＋3x=758x＋7－5x=25 2x＋23×4＋4x=1343x＋6－x=26 7x＋4＋5x－3=37 2y + 7 = 91 4(x＋10)＋2(x－7)=122 20 ÷( 10 ÷ x ) = 48m ÷ 2 = 15 17x – 6 × 7 = 60 3.7X + 6.5X = 1.02名师课堂——关键教方法——方老教你学数学17x - 6×7 = 60 12.6X – 9.7X = 17.4 0.5（ 2X + 0.8 ） = 8 5 ÷（ X + 1 ）= 0.2 4X – 0.3 × 1.9 = 20.3 5×( X - 1.8 ) = 5 ( X – 5 )×3 = 21.39x – 8 = 3x + 64 35 + 4X = 98 – 5X X – 20 = 320 – X 4X - 24 = 2X + 20 18 – 4X = 2X – 6 19X + 5 = 80 – 56X7（ 4 – X ）= 9（ X – 4 ） 3 ( X + 2 ) = 4 ( X + 1 )7x－535=（x－3）×63(x－2)－1 = 15－2(x＋2)名师课堂——关键教方法——方老教你学数学。