1. 直接写出得数。
$12 + 15 =$
$2 × 66 =$
$32 - 18 =$
$5 × 9 + 4 =$
$28 ÷ 4 =$
$12 × 2 =$
$50 × 8 =$
$6 × 7 + 7 =$
$300 × 7 =$
$35 × 2 =$
$42 × 6 =$
$(99 + 101) × 4 =$
$63 × 3 =$
$104 × 5 =$
$121 × 4 =$
$99 - 99 × 0 =$
$140 - 32 =$
$115 × 2 =$
$55 × 4 =$
$64 ÷ 8 × 4 =$
$4 × 19 =$
$320 × 4 =$
$63 ÷ 9 =$
$25 × 4 × 8 =$
$9 × 600 =$
$102 × 4 =$
$6 × 70 =$
$3 × (11 + 15) =$
$2 × 29 =$
$4 × 250 =$
$105 × 3 =$
$(92 - 46) × 5 =$

1. 27
132
14
49
7
24
400
49
2100
70
252
800
189
520
484
99
108
230
220
32
76
1280
7
800
5400
408
420
78
58
1000
315
230

2. 计算下面各题。
$898 - 18×7$
$(386 + 514)×6$
$462×(18÷6)$
$6×(39 + 41)$
$387×(201 - 192)$
$176 + 53×7$

2. 772
5400
1386
480
3483
547

已知5根黄绳与3根红绳一样长，9根红绳与3根蓝绳一样长，1根蓝绳和()根黄绳一样长。

5