题目内容
【题目】计算,能简算的要简算。
560+1440÷12×5
×
+
×
[1-
+
)]÷![]()
5.8×99+5.8
+
+
+
……+![]()
【答案】1160
![]()
580 ![]()
【解析】
560+1440÷12×5
=560+120×5
=560+600
=1160
×
+
×
=(
+
)× ![]()
=1× ![]()
= ![]()
[1-(
+
)]÷ ![]()
=(1-
)÷ ![]()
=
÷ ![]()
= ![]()
5.8×99+5.8
=5.8×(99+1)
=5.8×100
=580
+
+
+
……+ ![]()
=
+
×
+
×
+
×
+……+
×![]()
=
×(1+
+
+
+……+
)
=
×(1+
+
+
+……+
)×256÷256
=
×(256+128+64+32+16+8+4+2+1)÷256
=
×511× ![]()
= ![]()
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