题目内容

脱式计算.(能简算要简算的)
①2×3.6+3.6×7+3.6

②1.25×32×25
③5.42-(3.75-0.58)④34.7-
7
15
+65.3-
8
15
⑤
7
8
×
11
15
×1
1
7
×1
4
11
⑥23×
3
8
+57÷
8
3
.
①2×3.6+3.6×7+3.6,
=3.6×(2+7+1),
=3.6×10,
=36;

②1.25×32×25,
=(1.25×8)×(25×4),
=10×100,
=1000;

③5.42-(3.75-0.58),
=(5.42+0.58)-3.75,
=6-3.75,
=2.25;

④34.7-
7
15
+65.3-
8
15
,
=(34.7+65.3)-(
7
15
+
8
15
),
=100-1,
=99;

⑤
7
8
×
11
15
×1
1
7
×1
4
11
,
=(
7
8
×
8
7
)×(
11
15
×
15
11
),
=1×1,
=1;

⑥23×
3
8
+57÷
8
3
,
=23×
3
8
+57×
3
8
,
=(23+57)×
3
8
,
=80×
3
8
,
=30.
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