问题
解答题
|
答案
(1)6.13+28.86+13.87+1.14,
=(6.13+13.87)+(28.86+1.14),
=20+30,
=50;
(2)12×97+1.2×30,
=12×(97+3),
=12×100,
=1200;
(3)71÷60-68×
,1 60
=(71-68)×
,1 60
=3×
,1 60
=0.05;
(4)8.8×(3.75-1.25)×1.25,
=[(8+0.8)×1.25]×2.5,
=[8×1.25+0.8×1.25]×2.5,
=[10+1]×2.5,
=10×2.5+1×2.5,
=25+2.5,
=27.5;
(5)(
+3 4
×8 15
)÷5 12
,35 36
=(
+3 4
)÷2 9
,35 36
=
×3 4
+36 35
×2 9
,36 35
=
+27 35
,8 35
=1;
(6)(
-4 9
)×9×41,2 41
=
×9×41-4 9
×9×41,2 41
=4×41-2×9,
=164-18,
=146.