1. 填数或运算符号。

答案:
1. 150; 75; 2 56; 7; 8
×4; ×4; 3 3; 144; 48; 3(从左往右,从上到下的顺序)
×4; ×4; 3 3; 144; 48; 3(从左往右,从上到下的顺序)
2. 在$◯$里填运算符号,$□$里填数,使等号两边的式子相等。
$1 2 0 ÷ 1 5 = ( 1 2 0 ◯ □ ) ÷ ( 1 5 ÷ 3 )$
$2 7 0 ÷ 4 5 = ( 2 7 0 ÷ 9 ) ÷ ( 4 5 ◯ □ )$
$1 6 0 ÷ 3 2 = ( 1 6 0 ◯ □ ) ÷ ( 3 2 × 3 )$
$1 2 0 ÷ 1 5 = ( 1 2 0 ◯ □ ) ÷ ( 1 5 ÷ 3 )$
$2 7 0 ÷ 4 5 = ( 2 7 0 ÷ 9 ) ÷ ( 4 5 ◯ □ )$
$1 6 0 ÷ 3 2 = ( 1 6 0 ◯ □ ) ÷ ( 3 2 × 3 )$
答案:
2. ÷3; ÷9; ×3
3. 根据商不变的性质,在$□$里填数。
$1 5 0 ÷ 3 0 = 5 0 ÷ □$
$8 4 0 ÷ 6 0 = □ ÷ 4$
$3 6 0 ÷ 4 0 = □ ÷ 5$
$3 2 0 ÷ 6 4 = 8 0 ÷ □$
$1 5 0 ÷ 3 0 = 5 0 ÷ □$
$8 4 0 ÷ 6 0 = □ ÷ 4$
$3 6 0 ÷ 4 0 = □ ÷ 5$
$3 2 0 ÷ 6 4 = 8 0 ÷ □$
答案:
3. 10; 56; 45; 16
4. 在$□$里填数。
$1 2 0 ÷ 1 5 = □ ÷ □ = □ ÷ □ = □ ÷ □$
$1 4 0 ÷ 3 0 = □ ÷ □ = □ ÷ □ = □ ÷ □$
$1 2 0 ÷ 1 5 = □ ÷ □ = □ ÷ □ = □ ÷ □$
$1 4 0 ÷ 3 0 = □ ÷ □ = □ ÷ □ = □ ÷ □$
答案:
4.
120 ÷ 15 = 40 ÷ 5 = 8 ÷ 1 = 24 ÷ 3
140 ÷ 30 = 28 ÷ 6 = 56 ÷ 12 = 112 ÷ 24
120 ÷ 15 = 40 ÷ 5 = 8 ÷ 1 = 24 ÷ 3
140 ÷ 30 = 28 ÷ 6 = 56 ÷ 12 = 112 ÷ 24
5. 填表。(每支钢笔价格不变)

$3 0 ÷ 2 = □ ÷ 4 = 1 0 5 ÷ □$
$= □ ÷ 2 0 = 3 7 5 ÷ □$
$3 0 ÷ 2 = □ ÷ 4 = 1 0 5 ÷ □$
$= □ ÷ 2 0 = 3 7 5 ÷ □$
答案:
5.

30 ÷ 2 = 60 ÷ 4 = 105 ÷ 7
= 300 ÷ 20 = 375 ÷ 25
5.
30 ÷ 2 = 60 ÷ 4 = 105 ÷ 7
= 300 ÷ 20 = 375 ÷ 25
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