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1. 直接写出得数。(20☆)
$1.25 × 0.8 = $
$4.5 × 2 = $
$0.64 × 0.2 = $
$6.3 ÷ 0.7 = $
$3.08 × 0.01 = $
$72.8 × 0.1 = $
$0.4 × 0.08 = $
$0.78 ÷ 3 = $
$4.95 × 1000 = $
$48 ÷ 0.6 = $
$4.3 × 0.3 = $
$0.81 ÷ 0.09 = $
$6.9 × 0.1 = $
$7 - 0.23 = $
$3.6 ÷ 3 = $
$3.5 × 200 = $
$4.5 × 0.5 = $
$29 ÷ 100 = $
$1 ÷ 125 = $
$5.24 ÷ 0.04 = $
$2.4 ÷ 0.8 = $
$100 ÷ 0.4 = $
$20 ÷ 0.2 = $
$12.3 - 5.03 = $
$10.8 ÷ 9 = $
$4 ÷ 20 = $
$4.8 ÷ 0.3 = $
$3.4 × 0.5 = $
$9.6 ÷ 0.8 = $
$0.64 ÷ 0.32 = $
$6.3 ÷ 0.9 = $
$4.3 × 2 = $
$8x + 6x = $
$2 × c = $
$b × 6 × c = $
$8a + 10a = $
$6x + 3x - 4x = $
$6 × n = $
$1.2 × 3a = $
$4c × c = $
$1.25 × 0.8 = $
1
$4.5 × 2 = $
9
$0.64 × 0.2 = $
0.128
$6.3 ÷ 0.7 = $
9
$3.08 × 0.01 = $
0.0308
$72.8 × 0.1 = $
7.28
$0.4 × 0.08 = $
0.032
$0.78 ÷ 3 = $
0.26
$4.95 × 1000 = $
4950
$48 ÷ 0.6 = $
80
$4.3 × 0.3 = $
1.29
$0.81 ÷ 0.09 = $
9
$6.9 × 0.1 = $
0.69
$7 - 0.23 = $
6.77
$3.6 ÷ 3 = $
1.2
$3.5 × 200 = $
700
$4.5 × 0.5 = $
2.25
$29 ÷ 100 = $
0.29
$1 ÷ 125 = $
0.008
$5.24 ÷ 0.04 = $
131
$2.4 ÷ 0.8 = $
3
$100 ÷ 0.4 = $
250
$20 ÷ 0.2 = $
100
$12.3 - 5.03 = $
7.27
$10.8 ÷ 9 = $
1.2
$4 ÷ 20 = $
0.2
$4.8 ÷ 0.3 = $
16
$3.4 × 0.5 = $
1.7
$9.6 ÷ 0.8 = $
12
$0.64 ÷ 0.32 = $
2
$6.3 ÷ 0.9 = $
7
$4.3 × 2 = $
8.6
$8x + 6x = $
14x
$2 × c = $
2c
$b × 6 × c = $
6bc
$8a + 10a = $
18a
$6x + 3x - 4x = $
5x
$6 × n = $
6n
$1.2 × 3a = $
3.6a
$4c × c = $
4c²
答案
1. 1 9 0.128 9 0.0308 7.28 0.032 0.26 4950 80 1.29 9 0.69 6.77 1.2 700 2.25 0.29 0.008 131 3 250 100 7.27 1.2 0.2 16 1.7 12 2 7 8.6 14x 2c 6bc 18a 5x 6n 3.6a 4c²
2. 解方程。(18☆)
$9x = 27$
$x - 5.2 = 13.6$
$(13.6 + 12.8)x = 5.28$
$4.5x = 2.7$
$x + 2.6 × 8 = 45$
$4.5x + 3.8x = 16.6$
$9x = 27$
x=3
$x - 5.2 = 13.6$
x=18.8
$(13.6 + 12.8)x = 5.28$
x=0.2
$4.5x = 2.7$
x=0.6
$x + 2.6 × 8 = 45$
x=24.2
$4.5x + 3.8x = 16.6$
x=2
答案
2. x=3 x=18.8 x=0.2 x=0.6 x=24.2 x=2
3. 看图列方程并求解。(12☆)
方程：
方程：
方程：
x+4x=60
解：x=12
方程：
5x−x=16.4
解：x=4.1
答案
3. x+4x=60 x=12 5x−x=16.4 x=4.1
