——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 = 和 - 另一个加数;被减数 = 差 + 减数;减数 = 被减数 - 差; 一个因数 = 积 ÷另一个因数;被除数 = 商 ×除数;除数 = 被除数 ÷商。 例1: 20 + x = 32 x – 12 = 20 90 - x = 10
8 x = 56 x
练习: x + 15 = 28 x
12 ×x = 180 x
y – 21 = 14 a
例2: 20 + 5x = 40 4x
练习: 6 + 3x = 36 13x
7x + 3×4 = 47 8
6m = 42 3x + 6 = 15 0.5x
÷ 9 = 8 35 – 25 = 30 20 ÷ 20 = 8 98 – 18 = 26 x – 1 = 15 80 - 4x = 56 – 8 = 18 4x ×7 - 6x = 20 5x - 20÷ x = 7 – x =10 ÷ x = 14 ÷ 7 = 12
– 64 = 0 ÷4 = 15 – 2 = 24 名师课堂——关键教方法
——方老教你学数学
例3: 5x + 9x = 56 72x – 2x = 630 12X – 9X = 0
练习:2x + 8x = 100 2x – x = 65 21x - 18x = 312
2x + 20 = 80 4x + 9 = 249 y + 3y = 45
6x – x = 125 3y
3m + 2m = 65 6x
例4:3x ÷ 12 = 20 84
练习:4x × 12 = 144 6x
36 ÷ 2x = 2 2
– 6 = 48 m – 3x = 4.8 5x ÷ 2x = 21 5÷ 24 = 3 20 ×( x - 5 ) = 46 50 ÷ 0.6 = 4.5 – 3.9 = 5.1
×( x – 2 )= 40 ÷( 10 ÷ x ) = 4 ÷(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
3x-3.3 = 7.8 126÷x-26 = 16
3×5+3x=75
3x+6-x=26 7x+4+5x-3=37 2y + 7 = 91
4(x+10)+2(x-7)=122 20 ÷( 10 ÷ x ) = 4
8m ÷ 2 = 15 17x – 6 × 7 = 60 3.7X + 6.5X = 1.02
4.2 = x÷12 36-4x = 8
x÷2-5 = 16
8x+7-5x=25 2x+23×4+4x=134
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
9x – 8 = 3x + 64 35 + 4X = 98
X – 20 = 320 – X 4X - 24 = 2X + 20
18 – 4X = 2X – 6 19X + 5 = 80
7( 4 – X )= 9( X
7x-535=(x-3)×6
– 5 )×3 = 21.3 – 5X – 56X 4 ) 3 ( X + 2 ) = 4 ( X + 1 )
3(x-2)-1 = 15-2(x+2)
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