1. 直接写出得数。
$48÷ 8× 7 =$
$25× 2 - 20 =$
$2× 9÷ 6 =$
$(12 - 4)× 3 =$
$63 + 7× 4 =$
$54÷ 6 - 9 =$
$36 - 0÷ 23 =$
$45× 4× 0 =$
$48÷ 8× 7 =$
$25× 2 - 20 =$
$2× 9÷ 6 =$
$(12 - 4)× 3 =$
$63 + 7× 4 =$
$54÷ 6 - 9 =$
$36 - 0÷ 23 =$
$45× 4× 0 =$
答案
48÷8×7 = 42
25×2 - 20 = 30
2×9÷6 = 3
(12 - 4)×3 = 24
63 + 7×4 = 91
54÷6 - 9 = 0
36 - 0÷23 = 36
45×4×0 = 0
25×2 - 20 = 30
2×9÷6 = 3
(12 - 4)×3 = 24
63 + 7×4 = 91
54÷6 - 9 = 0
36 - 0÷23 = 36
45×4×0 = 0
2. 脱式计算。
(120 - 85)×12÷7
(900 - 16×35)÷34
22 + [(72 + 28)÷4]
(120 - 85)×12÷7
(900 - 16×35)÷34
22 + [(72 + 28)÷4]
答案
(120 - 85)×12÷7
= 35×12÷7
= 420÷7
= 60
(900 - 16×35)÷34
= (900 - 560)÷34
= 340÷34
= 10
22 + [(72 + 28)÷4]
= 22 + [100÷4]
= 22 + 25
= 47
= 35×12÷7
= 420÷7
= 60
(900 - 16×35)÷34
= (900 - 560)÷34
= 340÷34
= 10
22 + [(72 + 28)÷4]
= 22 + [100÷4]
= 22 + 25
= 47
1. 在括号里填上适当的数。
19 × (
943 ÷ (
19 × (
15
) =285943 ÷ (
12
) =78……7答案
1. 15 12
2. 一个数乘0,得(
0
);一个数加上0,得(原数
)。答案
2. 0 原数
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