计算下面各题,能用简便算法的要用简便方法哟! 218+324÷18×5 25×32×125 85.7-(15.1-6.8)
计算下面各题,能用简便算法的要用简便方法哟!218+324÷18×525×32×12585.7-(15.1-6.8)(75+240)÷(20-5)4.04-3.6+0.9...
计算下面各题,能用简便算法的要用简便方法哟! 218+324÷18×5 25×32×125 85.7-(15.1-6.8) (75+240)÷(20-5) 4.04-3.6+0.96 49×78+78×51.
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(1)218+324÷18×5,
=218+18×5,
=218+90,
=308;
(2)25×32×125,
=25×4×8×125,
=(25×4)×(8×125),
=100×1000,
=100000;
(3)85.7-(15.1-6.8),
=85.7-8.3,
=77.4;
(4)(75+240)÷(20-5),
=315÷15,
=21;
(5)4.04-3.6+0.96,
=(4.04+0.96)-3.6,
=5-3.6,
=1.4;
(6)49×78+78×51,
=78×(49+51),
=78×100,
=7800.
=218+18×5,
=218+90,
=308;
(2)25×32×125,
=25×4×8×125,
=(25×4)×(8×125),
=100×1000,
=100000;
(3)85.7-(15.1-6.8),
=85.7-8.3,
=77.4;
(4)(75+240)÷(20-5),
=315÷15,
=21;
(5)4.04-3.6+0.96,
=(4.04+0.96)-3.6,
=5-3.6,
=1.4;
(6)49×78+78×51,
=78×(49+51),
=78×100,
=7800.
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