问题
解答题
|
答案
(1)375+450÷18×20,
=375+25×20,
=375+500,
=875;
(2)9.47+0.58-2.47,
=9.47-2.47+0.58,
=7+0.58,
=7.58;
(3)
×8.4+1.6×0.7,7 10
=0.7×(8.4+1.6),
=0.7×10,
=7;
(4)
÷[2 9
×(8 21
+1 3
)],5 12
=
÷[2 9
×8 21
],3 4
=
÷2 9
,2 7
=
.7 9