計(jì)算:
3
4
+
1
6
-
3
8
=
②3.2-0.85-1
4
5
=
③3.2×
5
8
-
2
3
÷2=
④1.725×4×0.5=
⑤(
7
8
+
13
16
)÷
13
16
=
⑥1.8×0.72+1.28×1.8=
⑦2÷(
1
2
-
1
3
)=
⑧57.6÷[(1.25+25%)×0.32]=.
分析:①②③⑦⑧根據(jù)四則混合運(yùn)算法運(yùn)算順序計(jì)算即可:先算乘除,再算加減,有括號(hào)的要先算括號(hào)里面的;
④可根據(jù)乘法結(jié)合律計(jì)算;
⑤⑥可根據(jù)乘法分配律計(jì)算;
解答:解:①
3
4
+
1
6
-
3
8

=
11
12
-
3
8
,
=
13
24


②3.2-0.85-1
4
5

=2.35-1.8,
=0.55;

③3.2×
5
8
-
2
3
÷2
=2-
1
3
,
=1
2
3
;

④1.725×4×0.5
=1.725×(4×0.5),
=1.725×2,
=3.5;

⑤(
7
8
+
13
16
)÷
13
16

=
7
8
×
16
13
+
13
16
×
16
13
,
=
14
13
+1,
=2
1
13
;

⑥1.8×0.72+1.28×1.8
=1.8×(0.72+1.28),
=1.8×2,
=3.6;

⑦2÷(
1
2
-
1
3

=2÷
1
6
,
=12;

⑧57.6÷[(1.25+25%)×0.32]
=57.6÷[1.5×0.32],
=57.6÷0.48,
=120.
點(diǎn)評(píng):當(dāng)算式中同時(shí)含有中括號(hào)與小括號(hào)時(shí),要注意先算小括號(hào)里面的,再算中括號(hào)里面的.
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