题目内容

【题目】计算,能简算的要简算。
①560+1440÷12×5
× + ×
③[1- + )]÷
④5.8×99+5.8
+ + + ……+

【答案】解:
①560+1440÷12×5
=560+120×5
=560+600
=1160
× + ×
=( + )×
=1×
=
③[1-( + )]÷
=(1- )÷
= ÷
=
④5.8×99+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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