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901 + 109 + 91 = 320 ÷ (16 × 4) = 13 × ( ) = 910
25 × 640 = 101 × 88 = (78 - 29) × ( ) = 0
72 × 5 ÷ 72 × 5 = 6 × 98 + 12 = 125 × ( ) = 2000
25 × 640 = 101 × 88 = (78 - 29) × ( ) = 0
72 × 5 ÷ 72 × 5 = 6 × 98 + 12 = 125 × ( ) = 2000
答案
1. 在〇里填上“＞”“＜”或“=”。
840 ÷ (2 + 5)〇840 ÷ 2 + 840 ÷ 5 840 × (2 + 5)〇840 × 2 + 5
396 - 96 ÷ 6 × 2〇(396 - 96) ÷ (6 × 2)
840 ÷ (2 + 5)〇840 ÷ 2 + 840 ÷ 5 840 × (2 + 5)〇840 × 2 + 5
396 - 96 ÷ 6 × 2〇(396 - 96) ÷ (6 × 2)
答案
2. 选择合适的方法计算。
3600 ÷ 72 125 × 95 - 125 × 7
5235 - (1700 + 465) 25 × (4 + 8) × 125
999 × 998 + 1998 52 × 34 - ( ) × 34 + 50 × 34
(填一个数使计算更简便,并计算)
3600 ÷ 72 125 × 95 - 125 × 7
5235 - (1700 + 465) 25 × (4 + 8) × 125
999 × 998 + 1998 52 × 34 - ( ) × 34 + 50 × 34
(填一个数使计算更简便,并计算)
答案
