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1. 直接写出得数。
52 - 29 = 450 ÷ 9 = 120 - 78 = 53 - 18 + 49 =
78 + 26 = 38 × 5 = 63 + 59 = 720 ÷ 3 ÷ 8 =
100 ÷ 5 = 72 ÷ 4 = 400 × 7 = 14 × 6 + 5 =
64 ÷ 2 = 406 ÷ 2 = 108 × 9 = 84 ÷ 7 × 3 =
93 × 3 = 98 ÷ 7 = 90 - 24 = 65 ÷ (47 - 42) =
68 ÷ 4 = 8 × 16 = 106 - 58 = 92 + 8 × 17 =
408 ÷ 8 = 9 × 104 = 135 + 99 = 9 × (516 + 184) =
740 ÷ 5 = 370 × 3 = 109 × 3 = (600 - 100) ÷ 4 =
52 - 29 = 450 ÷ 9 = 120 - 78 = 53 - 18 + 49 =
78 + 26 = 38 × 5 = 63 + 59 = 720 ÷ 3 ÷ 8 =
100 ÷ 5 = 72 ÷ 4 = 400 × 7 = 14 × 6 + 5 =
64 ÷ 2 = 406 ÷ 2 = 108 × 9 = 84 ÷ 7 × 3 =
93 × 3 = 98 ÷ 7 = 90 - 24 = 65 ÷ (47 - 42) =
68 ÷ 4 = 8 × 16 = 106 - 58 = 92 + 8 × 17 =
408 ÷ 8 = 9 × 104 = 135 + 99 = 9 × (516 + 184) =
740 ÷ 5 = 370 × 3 = 109 × 3 = (600 - 100) ÷ 4 =
答案
1. 23 50 42 84
104 190 122 30
20 18 2800 89
32 203 972 36
279 14 66 13
17 128 48 228
51 936 234 6300
148 1110 327 125
104 190 122 30
20 18 2800 89
32 203 972 36
279 14 66 13
17 128 48 228
51 936 234 6300
148 1110 327 125
2. 用竖式计算，并验算。
454 - 86 = 502 - 39 = 684 + 84 =
900 - 216 = 786 + 828 = 456 + 347 =
454 - 86 = 502 - 39 = 684 + 84 =
900 - 216 = 786 + 828 = 456 + 347 =
答案
2. 368 463 768
684 1614 803
竖式及验算略
684 1614 803
竖式及验算略
在一道减法算式里，被减数、减数与差的和是 120，差是减数的 3 倍，被减数、减数和差分别是多少？
答案
思维提升
被减数：120÷2=60
减数：60÷(1+3)=15
差：15×3=45
被减数：120÷2=60
减数：60÷(1+3)=15
差：15×3=45
