(1)175-28-72(2)786-(158+286)(3)49+58+42+51(4)72720÷9÷8(5)2000÷125÷8(6)125×104-5
(1)175-28-72(2)786-(158+286)(3)49+58+42+51(4)72720÷9÷8(5)2000÷125÷8(6)125×104-500....
(1)175-28-72(2)786-(158+286)(3)49+58+42+51(4)72720÷9÷8(5)2000÷125÷8(6)125×104-500.
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(1)175-28-72,
=175-(28+72),
=175-100,
=75;
(2)786-(158+286),
=786-286-158,
=500-158,
=342;
(3)49+58+42+51,
=(49+51)+(58+42),
=100+100,
=200;
(4)72720÷9÷8,
=72720÷(9×8),
=72720÷72,
=1010;
(5)2000÷125÷8,
=2000÷(125×8),
=2000÷1000,
=2;
(6)125×104-500,
=125×104-125×4,
=125×(104-4),
=125×100,
=12500.
=175-(28+72),
=175-100,
=75;
(2)786-(158+286),
=786-286-158,
=500-158,
=342;
(3)49+58+42+51,
=(49+51)+(58+42),
=100+100,
=200;
(4)72720÷9÷8,
=72720÷(9×8),
=72720÷72,
=1010;
(5)2000÷125÷8,
=2000÷(125×8),
=2000÷1000,
=2;
(6)125×104-500,
=125×104-125×4,
=125×(104-4),
=125×100,
=12500.
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