2356-(1356-721) 1235-(1780-1665) 75×27+19×2 5 31×870+13×310 4×(25×65+25×28) (1)(78+61)+39 (2)700-82-18
(3)348+163+242+410+537
(4)125×47-47×25 (5)201×316
(6)374-205+226-95
(7)3000-999
(8)997×7+21 (9)87×470+870×53 (10)(55+55+55+55×5)×125 (11)125×(8+40)×25 (12)99+49×99 (13)264×97+4×264 (14)454+999×999+545
(15)9999×36+6666×3×32
(16)124×38+65×124+76×110-76×7
(17)62×4+44×5+5×18
(18)3400-62×34-38×20-38×14
(19)1992×19911991-1991×19901990 (20(2+4+6+……+100)-(1+3+5+……+99)
1. 2.73 + 0.89 + 1.27 2. 4.37 + 0.28 + 1.63 + 5.72 1. 10 - 0.432 - 2.568 2. 9.3 - 5.26 - 2.74
3. 13.4-(3.4+5.2)
4. 14.9-(5.2+4.9)
5. 18.32 - 5.47 - 4.32
6. 17.29 - 5.28 - 6.29
1. 25 × 6.8 × 0.04 2. 0.25 × 32 × 0.125 3. 6.4 × 1.25 × 12.5 1. 0.45 × 201 2. 0.58 × 10.1 3. 50.2 × 99
4. 4.7 × 9.9
5. 3.28 × 5.7 + 6.72 × 5.7
6. 2.1 × 99 + 2.1
7. 1.7 × 9.9 + 0.17
8. 23 × 0.1 + 2.3 × 9.9 1. 0.18 +4.26 -0.18 +4.26 ☆ 2. 0.58 ×1.3 ÷ 0.58 ×1.3 ☆ 3. 7.3 ÷4 + 2.7 × 0.25 ☆ 4. 3.75 × 0.5 - 2.75 ÷ 2 ☆ 5. 5.26 × 0.125 + 2.74 ÷ 8 ☆
a ÷ b ÷ c = a ÷ (b × c)
6. 6.3 ÷ 1.8
7. 4.2 ÷ 3.5
8. 9.5 ÷(1.9 × 8)