题目内容
计算
(1)22+(-4)-(-2)+4
(2)(-26.54)+(-6.4)-18.54+6.4
(3)(-1
)×(-
)÷(-2
)
(4)(
-
+
-0.01)×(-100)
(5)99
×(-36)
(6)-24÷(-
+
-
).
(1)22+(-4)-(-2)+4
(2)(-26.54)+(-6.4)-18.54+6.4
(3)(-1
1 |
2 |
3 |
4 |
1 |
4 |
(4)(
1 |
2 |
1 |
5 |
7 |
10 |
(5)99
71 |
72 |
(6)-24÷(-
1 |
2 |
3 |
4 |
1 |
3 |
分析:(1)(2)先化简,再分类计算;
(3)先判定符号,再把带分数化为假分数,把除法改为乘法计算;
(4)(5)利用乘法分配律简算;
(6)先算括号内的加减,再算除法.
(3)先判定符号,再把带分数化为假分数,把除法改为乘法计算;
(4)(5)利用乘法分配律简算;
(6)先算括号内的加减,再算除法.
解答:解:(1)原式=22-4+2+4
=22+2-4+4
=24;
(2)原式=-26.54-6.4-18.54+6.4
=-26.54-18.54+6.4-6.4
=45.08;
(3)(-1
)×(-
)÷(-2
)
=-
×
×
=-
;
(4)原式=
×(-100)-
×(-100)+
×(-100)-0.01×(-100)
=-50+20-70+1
=-99;
(5)原式=(100-
)×(-36)
=100×(-36)-
×(-36)
=-3600+
=-3599
;
(6)原式=-24÷(-
)
=24×12
=288.
=22+2-4+4
=24;
(2)原式=-26.54-6.4-18.54+6.4
=-26.54-18.54+6.4-6.4
=45.08;
(3)(-1
1 |
2 |
3 |
4 |
1 |
4 |
=-
3 |
2 |
3 |
4 |
4 |
9 |
=-
1 |
2 |
(4)原式=
1 |
2 |
1 |
5 |
7 |
10 |
=-50+20-70+1
=-99;
(5)原式=(100-
1 |
72 |
=100×(-36)-
1 |
72 |
=-3600+
1 |
2 |
=-3599
1 |
2 |
(6)原式=-24÷(-
1 |
12 |
=24×12
=288.
点评:此题考查有理数的混合运算,注意抓住数字特点,灵活选用运算定律简算.
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