题目内容

能简算就简算.
1.25×7×0.8

7.28-3.14+1.72-2.86
(100-1456÷26)×78
1
12
+
1
9
+
3
18
)×36.
(1)1.25×7×0.8,
=7×(1.25×0.8),
=7×1,
=7;

(2)7.28-3.14+1.72-2.86,
=7.28+1.72-(3.14+2.86),
=9-6,
=3;

(3)(100-1456÷26)×78,
=(100-56)×78,
=44×78,
=3432;

(4)(
1
12
+
1
9
+
3
18
)×36,
=
1
12
×
36+
1
9
×
36+
3
18
×
36,
=3+4+6,
=13.
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