天天33684
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共回答了18个问题采纳率:94.4% 举报
(1)1.29+3.7+0.71+6.3,
=(1.29+0.71)+(3.7+6.3),
=2+10,
=12;
(2)528×78+472×78,
=(528+472)×78,
=1000×78,
=78000;
(3)99×45+45,
=(99+1)×45,
=100×45,
=4500;
(4)456-189-11,
=456-(189+11),
=456-200,
=256;
(5)19×96-962÷74,
=1824-13,
=1811;
(6)(520+480)÷50×4,
=1000÷50×4,
=20×4,
=80;
(7)400-(1300÷65+35),
=400-(20+35),
=400-55,
=345;
(8)86.7-(14.3-3.8),
=86.7-10.5,
=76.2.
1年前
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