运用乘法的运算定律计算下面各题.(125-40)×8 57×15+23×15 125×32-125×24 45×102 25×44
运用乘法的运算定律计算下面各题.(125-40)×857×15+23×15125×32-125×2445×10225×4481+9×81....
运用乘法的运算定律计算下面各题.(125-40)×8 57×15+23×15 125×32-125×24 45×102 25×44 81+9×81.
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(1)(125-40)×8,
=125×8-40×8,
=1000-320,
=680;
(2)57×15+23×15,
=(57+23)×15,
=80×15,
=1200;
(3)125×32-125×24,
=125×(32-24),
=125×8,
=1000;
(4)45×102,
=45×(100+2),
=45×100+45×2,
=4500+90,
=4590;
(5)25×44,
=25×4×11,
=100×11,
=1100;
(6)81+9×81,
=81×1+9×81,
=81×(1+9),
=81×10,
=810.
=125×8-40×8,
=1000-320,
=680;
(2)57×15+23×15,
=(57+23)×15,
=80×15,
=1200;
(3)125×32-125×24,
=125×(32-24),
=125×8,
=1000;
(4)45×102,
=45×(100+2),
=45×100+45×2,
=4500+90,
=4590;
(5)25×44,
=25×4×11,
=100×11,
=1100;
(6)81+9×81,
=81×1+9×81,
=81×(1+9),
=81×10,
=810.
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