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:

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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