简便计算39+42+158+561 851-543-57 3200÷4÷25 678-(65+78)+35 125...
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发布时间:2024-10-24 12:59
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(1)39+42+158+561
=(39+561)+(42+158)
=600+200
=800;
(2)851-543-57
=851-(543+57)
=851-600
=251;
(3)3200÷4÷25
=3200÷(4×25)
=3200÷100
=32;
(4)678-(65+78)+35
=678-65-78+35
=678-78-(65-35)
=600-30
=570;
(5)125×25×32
=(125×8)×(4×25)
=1000×100
=100000;
(6)54×37-37×46
=(54-46)×37
=8×37
=296;
(7)88×125
=11×(8×125)
=11×1000
=11000;
(8)201×35-35
=(201-1)×35
=200×35
=7000;
(9)250×13×4
=(250×4)×13
=1000×13
=13000.