问题
解答题
怎样算简便就怎样算
|
答案
(1)1.25×32×2.5,
=1.25×8×4×2.5,
=10×10,
=100,
(2)
+3 4
×1 4
,4 7
=
+3 4
,1 7
=
;25 28
(3)7.38-(1.57+2.38),
=7.38-1.57-2.38,
=7.38-2.38-1.57,
=5-1.57,
=3.43;
(4)
+9 10
×99,9 10
=
×(1+99),9 10
=
×100,9 10
=90;
(5)
÷[1÷(1 6
-3 5
)],3 10
=
÷[1÷1 6
],3 10
=
÷1 6
,10 3
=
;1 20
(6)9315÷23+77,
=405+77,
=482.