问题
解答题
用递等式计算 (1)1379+450÷18×40 (2)(3.2÷16+10.8)÷22 (3)
(4)
|
答案
(1)1379+450÷18×40,
=1379+25×40,
=1379+1000,
=2379;
(2)(3.2÷16+10.8)÷22,
=(0.2+10.8)÷22,
=11÷22,
=0.5;
(3)
×5 11
+7 25
×7 25
,6 11
=(
+5 11
)×6 11
,7 25
=1×
,7 25
=
;7 25
(4)
×1 4
÷( 1 7
-5 6
),3 4
=
×1 4
÷1 7
,1 12
=
×1 4
×12,1 7
=
×12×1 4
,1 7
=3×
,1 7
=
.3 7