
计算:(1)(-18)÷214×49÷(-16)(2)(79-56+34)×(-36)(3)392324×(-12)(4)25×34-(-2
计算:(1)(-18)÷214×49÷(-16)(2)(79-56+34)×(-36)(3)392324×(-12)(4)25×34-(-25)×12+25×(-14)...
计算:(1)(-18)÷214×49÷(-16)(2)(79-56+34)×(-36)(3)392324×(-12)(4)25×34-(-25)×12+25×(-14)
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(1)(-18)÷2
×
÷(-16),
=18×
×
×
,
=
;
(2)(
-
+
)×(-36),
=
×(-36)-
×(-36)+
×(-36),
=-28+25-27,
=-55+25,
=-30;
(3)39
×(-12),
=(40-
)×(-12),
=40×(-12)-
×(-12),
=-480+
,
=-479
;
(4)25×
-(-25)×
+25×(-
),
=25×(
+
-
),
=25×1,
=25.
1 |
4 |
4 |
9 |
=18×
4 |
9 |
4 |
9 |
1 |
16 |
=
2 |
9 |
(2)(
7 |
9 |
5 |
6 |
3 |
4 |
=
7 |
9 |
5 |
6 |
3 |
4 |
=-28+25-27,
=-55+25,
=-30;
(3)39
23 |
24 |
=(40-
1 |
24 |
=40×(-12)-
1 |
24 |
=-480+
1 |
2 |
=-479
1 |
2 |
(4)25×
3 |
4 |
1 |
2 |
1 |
4 |
=25×(
3 |
4 |
1 |
2 |
1 |
4 |
=25×1,
=25.
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