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1. 直接写出得数。(每题2★)
$72 - 13 - 17 = $ $26 - 12 + 6 = $ $99 - 28 - 32 = $
$72 - (13 + 17) = $ $26 - (12 - 6) = $ $43 - (33 - 15) = $
$24 ÷ 3 ÷ 2 = $ $16 ÷ 8 × 2 = $ $18 ÷ 3 ÷ 3 = $
$24 ÷ (3 × 2) = $ $16 ÷ (8 ÷ 2) = $ $81 ÷ 9 × 3 = $
$7 × (24 ÷ 3) = $ $6 × 7 ÷ 7 = $ $18 + 5 × 4 = $
$54 ÷ (17 - 8) = $ $48 ÷ 6 - 2 = $ $(38 - 29) × 5 = $
$72 - 13 - 17 = $ $26 - 12 + 6 = $ $99 - 28 - 32 = $
$72 - (13 + 17) = $ $26 - (12 - 6) = $ $43 - (33 - 15) = $
$24 ÷ 3 ÷ 2 = $ $16 ÷ 8 × 2 = $ $18 ÷ 3 ÷ 3 = $
$24 ÷ (3 × 2) = $ $16 ÷ (8 ÷ 2) = $ $81 ÷ 9 × 3 = $
$7 × (24 ÷ 3) = $ $6 × 7 ÷ 7 = $ $18 + 5 × 4 = $
$54 ÷ (17 - 8) = $ $48 ÷ 6 - 2 = $ $(38 - 29) × 5 = $
答案
42 20 39
42 20 25
4 4 2
4 4 27
56 6 38
6 6 45
42 20 25
4 4 2
4 4 27
56 6 38
6 6 45
2. 计算。(每题2★)
$56 - (26 + 13)$ $9 × 8 + 15$ $51 - 28 ÷ 7$
$5 × (25 - 17)$ $(32 + 4) ÷ 4$ $(54 + 10) ÷ 8$
$32 ÷ (4 × 2)$ $(55 - 7) ÷ 6$ $(54 - 19) ÷ 5$
$56 - (26 + 13)$ $9 × 8 + 15$ $51 - 28 ÷ 7$
$5 × (25 - 17)$ $(32 + 4) ÷ 4$ $(54 + 10) ÷ 8$
$32 ÷ (4 × 2)$ $(55 - 7) ÷ 6$ $(54 - 19) ÷ 5$
答案
17 87 47
40 9 8
4 8 7
40 9 8
4 8 7
