问题
解答题
脱式计算,能简算的要简算. ①2013×0.25+2013×0.75 ②1.25×32×0.25 ③12×(
④
|
答案
①2013×0.25+2013×0.75
=2013×(0.25+0.75)
=2013×1
=2013;
②1.25×32×0.25
=1.25×(8×4)×0.25
=(1.25×8)×(4×0.25)
=10×1
=10;
③12×(
+5 6
-1 2
)1 3
=12×
+12×5 6
-12×1 2
)1 3
=10+6-4
=16-4
=12;
④
+(2 3
-5 6
)÷3 4 3 8
=
+2 3
÷1 12 3 8
=
+2 3 2 9
=
.8 9