问题
解答题
|
答案
(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
)×36,3 18
=
×36+1 12
×36+1 9
×36,3 18
=3+4+6,
=13.