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四、解方程。
1. $x - 2.9 = 10$
2. $58.3 - x = 4.9$
3. $3x = 27$
4. $x ÷ 23 = 9$
5. $4m = 720$
6. $x ÷ 53 = 0$
1. $x - 2.9 = 10$
2. $58.3 - x = 4.9$
3. $3x = 27$
4. $x ÷ 23 = 9$
5. $4m = 720$
6. $x ÷ 53 = 0$
答案
1. x = 12.9 2. x = 53.4 3. x = 9 4. x= 207
5. m = 180 6. x=0
5. m = 180 6. x=0
$△ + △ + △ = 12$
$□ × △ = 20$
$◯ ÷ □ = 25$
$△ = (\quad) \quad □ = (\quad)$
$◯ = (\quad)$
答案
解：
由△+△+△=12，得△=12÷3=4；
由□×△=20，△=4，得□=20÷4=5；
由◯÷□=25，□=5，得◯=25×5=125；
△=(4) □=(5) ◯=(125)
由△+△+△=12，得△=12÷3=4；
由□×△=20，△=4，得□=20÷4=5；
由◯÷□=25，□=5，得◯=25×5=125；
△=(4) □=(5) ◯=(125)
算一算
7.26 - 4.93 =
7.65 - 6.23 =
5.32 - 0.93 =
6.35 - 5.23 =
34.52 - 17.87 =
8.46 - 1.36 =
8.72 - 2.27 =
10 - 2.16 =
4.23 - 0.84 =
20 - 0.92 =
7.26 - 4.93 =
7.65 - 6.23 =
5.32 - 0.93 =
6.35 - 5.23 =
34.52 - 17.87 =
8.46 - 1.36 =
8.72 - 2.27 =
10 - 2.16 =
4.23 - 0.84 =
20 - 0.92 =
答案
7.26 - 4.93 = 2.33
7.65 - 6.23 = 1.42
5.32 - 0.93 = 4.39
6.35 - 5.23 = 1.12
34.52 - 17.87 = 16.65
8.46 - 1.36 = 7.1
8.72 - 2.27 = 6.45
10 - 2.16 = 7.84
4.23 - 0.84 = 3.39
20 - 0.92 = 19.08
7.65 - 6.23 = 1.42
5.32 - 0.93 = 4.39
6.35 - 5.23 = 1.12
34.52 - 17.87 = 16.65
8.46 - 1.36 = 7.1
8.72 - 2.27 = 6.45
10 - 2.16 = 7.84
4.23 - 0.84 = 3.39
20 - 0.92 = 19.08
