
计算(1)312?(?214)+(?13)?14?(+16).(2)3+50÷22×(-15)-1.(3)25×34?(?25)×12+25×(?14).(4
计算(1)312?(?214)+(?13)?14?(+16).(2)3+50÷22×(-15)-1.(3)25×34?(?25)×12+25×(?14).(4)[1-(1...
计算(1)312?(?214)+(?13)?14?(+16).(2)3+50÷22×(-15)-1.(3)25×34?(?25)×12+25×(?14).(4)[1-(1-0.5×13)]×[2-(-3)2].
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(1)原式=3
+2
-
-
-
=3
+2-
-
=3
+2-
=5;
(2)原式=3-50×
×
-1=3-2
-1=-
;
(3)原式=
+
-
=
+
=25;
(4)原式=[1-1+
]×[2-9]=
×(-7)=-
.
1 |
2 |
1 |
4 |
1 |
3 |
1 |
4 |
1 |
6 |
1 |
2 |
1 |
3 |
1 |
6 |
1 |
2 |
1 |
2 |
(2)原式=3-50×
1 |
4 |
1 |
5 |
1 |
2 |
1 |
2 |
(3)原式=
75 |
4 |
25 |
2 |
25 |
4 |
25 |
2 |
25 |
2 |
(4)原式=[1-1+
1 |
6 |
1 |
6 |
7 |
6 |
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