计算下面各题,怎样简便就怎样算 1.29+3.7+0.71+6.3 125×76×8 8.33-2.43-4.57 75+360÷(
计算下面各题,怎样简便就怎样算1.29+3.7+0.71+6.3125×76×88.33-2.43-4.5775+360÷(20-5)49×102-2×4949.62+2...
计算下面各题,怎样简便就怎样算 1.29+3.7+0.71+6.3 125×76×8 8.33-2.43-4.57 75+360÷(20-5) 49×102-2×49 49.62+27.17-19.62.
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(1)1.29+3.7+0.71+6.3,
=(1.29+0.71)+(3.7+6.3),
=2+10,
=12;
(2)125×76×8,
=(125×8)×76,
=1000×76,
=76000;碰橘毁
(3)8.33-2.43-4.57,
=8.33-(2.43+4.57),
=8.33-7,
=1.33;
(4)75+360÷(20-5),
=75+360÷15,
=75+24,
=99;
(5)伍芹49×102-2×49,
=49×(102-2),笑备
=49×100,
=4900;
(6)49.62+27.17-19.62,
=(49.62-19.62)+27.17,
=30+27.12,
=57.12.
=(1.29+0.71)+(3.7+6.3),
=2+10,
=12;
(2)125×76×8,
=(125×8)×76,
=1000×76,
=76000;碰橘毁
(3)8.33-2.43-4.57,
=8.33-(2.43+4.57),
=8.33-7,
=1.33;
(4)75+360÷(20-5),
=75+360÷15,
=75+24,
=99;
(5)伍芹49×102-2×49,
=49×(102-2),笑备
=49×100,
=4900;
(6)49.62+27.17-19.62,
=(49.62-19.62)+27.17,
=30+27.12,
=57.12.
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