计算(1)-20+(-14)-(-18)-13;(2)234+0.25?(?712)+(?214)?1.5?2.75;(3)(?34?59+712)÷136;(4
计算(1)-20+(-14)-(-18)-13;(2)234+0.25?(?712)+(?214)?1.5?2.75;(3)(?34?59+712)÷136;(4)?14...
计算(1)-20+(-14)-(-18)-13;(2)234+0.25?(?712)+(?214)?1.5?2.75;(3)(?34?59+712)÷136;(4)?14÷(?5)2×(?53)+|0.8?1|.
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(1)-20+(-14)-(-18)-13
=-20-14+18-13
=-29;
(2)2
+0.25?(?7
)+(?2
)?1.5?2.75
=2.75+0.25+7.5-2.25-1.5-2.75
=(2.75-2.75)+(0.25-2.25)+(7.5-1.5)
=0-2+6
=4;
(3)(?
?
+
)÷
=(-
-
+
)×36
=-27-20+21
=-26;
(4)?14÷(?5)2×(?
)+|0.8?1|
=1×
×
+0.2
=
+
=
.
=-20-14+18-13
=-29;
(2)2
3 |
4 |
1 |
2 |
1 |
4 |
=2.75+0.25+7.5-2.25-1.5-2.75
=(2.75-2.75)+(0.25-2.25)+(7.5-1.5)
=0-2+6
=4;
(3)(?
3 |
4 |
5 |
9 |
7 |
12 |
1 |
36 |
=(-
3 |
4 |
5 |
9 |
7 |
12 |
=-27-20+21
=-26;
(4)?14÷(?5)2×(?
5 |
3 |
=1×
1 |
25 |
5 |
3 |
=
1 |
15 |
3 |
15 |
=
4 |
15 |
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