计算 52.4×3/4+45.6×0.75+2÷11/3 1/2+3/4+7/8+15/16+31/32+63/64+127/128.
问题描述:
计算
52.4×
+45.6×0.75+2÷13 4
1 3
+1 2
+3 4
+7 8
+15 16
+31 32
+63 64
. 127 128
答
(1)52.4×
+45.6×0.75+2÷13 4
1 3
=(52.4+45.6+2)×
3 4
=100×
3 4
=75;
(2)
+1 2
+3 4
+7 8
+15 16
+31 32
+63 64
127 128
=1-
+1-1 2
+1-1 4
+、+1-1 8
1 128
=(1+1+1+1+1+1+1)-(
+1 2
+、+1 4
)1 128
=7-(1-
+1 2
-1 2
+、+1 4
-1 64
)1 128
=7-
127 128
=6
.1 128