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1. 直接写出得数。(每题 1★)
$3 + 5×8 = $ $(54 - 24)÷6 = $ $12÷(4 + 2) = $
$(3 + 5)×8 = $ $54 - 24÷6 = $ $12÷4 + 2 = $
$18 + 54÷9 = $ $3×5 - 2 = $ $24÷4×2 = $
$(18 + 54)÷9 = $ $3×(5 - 2) = $ $24÷(4×2) = $
$42 - (17 + 13) = $ $92 - (36 - 22) = $ $2×9÷3 = $
$42 - 17 + 13 = $ $92 - 36 - 22 = $ $2×(9÷3) = $
$3 + 5×8 = $ $(54 - 24)÷6 = $ $12÷(4 + 2) = $
$(3 + 5)×8 = $ $54 - 24÷6 = $ $12÷4 + 2 = $
$18 + 54÷9 = $ $3×5 - 2 = $ $24÷4×2 = $
$(18 + 54)÷9 = $ $3×(5 - 2) = $ $24÷(4×2) = $
$42 - (17 + 13) = $ $92 - (36 - 22) = $ $2×9÷3 = $
$42 - 17 + 13 = $ $92 - 36 - 22 = $ $2×(9÷3) = $
答案
43 5 2
64 50 5
24 13 12
8 9 3
12 78 6
38 34 6
![img alt=1]
64 50 5
24 13 12
8 9 3
12 78 6
38 34 6
![img alt=1]
2. 计算。(每题 3★)
$51 - (23 + 19)$ $68 - (32 - 24)$ $8×(14÷2)$
$(92 - 62)÷5$ $8×(7 - 3)$ $(35 + 14)÷7$
$72÷(36÷4)$ $56 - 32÷8$ $81÷(76 - 67)$
$51 - (23 + 19)$ $68 - (32 - 24)$ $8×(14÷2)$
$(92 - 62)÷5$ $8×(7 - 3)$ $(35 + 14)÷7$
$72÷(36÷4)$ $56 - 32÷8$ $81÷(76 - 67)$
答案
9 60 56
6 32 7
8 52 9
6 32 7
8 52 9
