初一数学每章题海练习题
-
1
2
1.<
/p>
若
|
x
-
2|+|
y
+3|+|
z
-
5|=0
计算
< br>:
(
1
)
x
,
y
,
z
的值
.
(
2<
/p>
)求
|
x
|+|
y
|+|
z
|
的值
.
2.
若
2<
a
<4,
化简
|2
-
a
|+|
a
-
4|.
x
x
3.
(<
/p>
1
)若
x
=1,
求
x
.
< br>(
2
)若
x
=
-
1,
求
x
.
五、计算
1
(
1
)
|<
/p>
-
2|
×
(
p>
-
2)=_____
(
2
)
|
-
2
|
×
5.2=_____
1
1
(
3
p>
)
|
-
2
|
-
2
=_____
(
4
)
-
p>
3
-
|
-
5.3|=_____
116
.
-84-(16-3)+7<
/p>
.
118
.
-0.182+3.105-(0.318-6.065)
.<
/p>
119<
/p>
.
-2.9+[1.7-(7+3.7-2.1)]
121
.
34.23-[194.6-(5.77-5.4)]
.
.
23.
6+[3.9-(17.8-4.8+15.4)]
.
3
125
134
.
(-3)
2
÷
2.5
.
135
.
(
-2.5
2
)
×
(-4)
.
136
.
(
-3
2
)
÷
(
-2)
2
.
4
2
p>
173
.
(-1)
2
×
5+(-1)
×
< br>5
2
-1
×
5+(-1
×
5)
2
.
174
.
(
-2)(-3)(-36)+(-1)
20
×
< br>6
3
.
p>
178
.
(-3
2
)
÷
(3
×<
/p>
2)
×
(-3-2)
.
180
.
3
×
(-2)
2
+(-2
×
3)
2
+(-2+3)
2
.
5
188
.
2+4
2
×
(-8)
×
16
÷
32
.
190
.
[5.78+3.51-(0.7)
2
]
÷
(0.2)
3
×
11
.
191
.
(1.25)
4
÷
(0.125)
4
×
0
.0036-(0.6)
2
.
p>
194
.
(-4
2
×
26+13
2
×
2)
÷
(-3)
< br>7
×
(-3)
5
.
p>
195
.
(3-9)
4
×
2
3
×
(-0.125)
2
.
2
201<
/p>
.
741
×
[(
-30)
2
-(-40
)]
3
÷
(1250)
2
p>
.
6
211
.
[(-5)
3
+3.4
×
2-2
×
4+5
3
]
2
.
213
.
(
2
4
-5.1
×
3-3
×
5+3
3
< br>)
2
.
7