问题
解答题
脱式计算.(能简算的要简算) 1305-386-614 (
1.25×32×2.5 10.9-(
|
答案
(1)1305-386-614,
=1305-(386+614),
=1305-1000,
=305;
(2)(
+1 4
-2 3
)×12,5 6
=
×12+1 4
×12-2 3
×12,5 6
=3+8-10,
=1;
(3)1.25×32×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100;
(4)10.9-(
+9.6÷4),4 5
=10.9-(
+2.4),4 5
=10.9-3.2,
=7.7.