能簡(jiǎn)算的要簡(jiǎn)算
3
3
4
-
1
3
+1
5
6
=
8
3
4
÷21×1
3
5
=
9.87-5
7
8
-0.125=
4
3
10
×7
3
5
+2.4×4
3
10
=
3.2÷1
3
5
-
3
5
×0.75
=
(8-3.5×
2
5
)÷(
3
5
+0.25
)=
[4.8+1
2
5
×(3
2
7
-1.5)]÷0.12=
分析:(1)先算減法,再算加法;
(2)先算除法,再算乘法;
(3)根據(jù)減法的性質(zhì)進(jìn)行簡(jiǎn)算;
(4)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(5)先算除法和乘法,再算減法;
(6)先算小括號(hào)里面的乘法和加法,再算減法,最后算除法;
(7)先算減法,再算乘法,再算加法,最后算除法.
解答:解:(1)3
3
4
-
1
3
+1
5
6

=3
5
12
+1
5
6

=5
1
4
;

(2)8
3
4
÷21×1
3
5

=
5
12
×1
3
5

=
2
3


(3)9.87-5
7
8
-0.125
=9.87-(5
7
8
+0.125)
=9.87-6
=3.87;

(4)4
3
10
×7
3
5
+2.4×4
3
10

=4
3
10
×(7
3
5
+2.4)
=4
3
10
×10
=43;

(5)3.2÷1
3
5
-
3
5
×0.75

=2-0.45
=1.55;

(6)(8-3.5×
2
5
)÷(
3
5
+0.25

=(8-1.4)÷0.85
=6.6÷0.85
=
132
17
;

(7)[4.8+1
2
5
×(3
2
7
-1.5)]÷0.12
=[4.8+1
2
5
×
25
14
]÷0.12
=[4.8+2.5]÷0.12
=7.3÷0.12
=60
5
6
點(diǎn)評(píng):考查了運(yùn)算定律與簡(jiǎn)便運(yùn)算,四則混合運(yùn)算.注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律簡(jiǎn)便計(jì)算.
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