问题
解答题
脱式计算.(能简算的要简算) (50-40×1.2)÷0.5 8×4×125×25 18.8-
32×71.1+28.9×32. |
答案
①(50-40×1.2)÷0.5
=(50-48)÷0.5
=2÷0.5
=4;
②8×4×125×25
=(8×125)×(4×25)
=1000×100
=100000;
③18.8-
-3.8-2 3 1 3
=(18.8-3.8)-(
+2 3
)1 3
=15-1
=14;
④32×71.1+28.9×32
=32×(71.1+28.9)
=32×100
=3200.