问题 解答题

脱式计算.

6450-2600÷650×278

(512+2688÷56)×73

(9640-5230)÷(38+25)

答案

(1)6450-2600÷650×278

=6450-[4×(300-22)],

=6450-[4×300-4×22],

=6450-[1200-88],

=6450-1112,

=5338;

(2)(512+2688÷56)×73

=(512+48)×73,

=560×(70+3),

=560×70+560×3,

=39200+1680,

=40880;

(3)(9640-5230)÷(38+25)

=4410÷63,

=70.

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