用简便计算:149X69-149+149X32,37X99+37,169X123-23X169,129X101-129...
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发布时间:2024-10-24 03:00
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时间:2024-10-26 22:47
149X69-149+149X32
=149×(69-1+32)
=149×100
=14900
37X99+37
=37×(99+1)
=37×100
=3700
169X123-23X169
=169×(123-23)
=169×100
=16900
129X101-129
=129×(101-1)
=129×100
=12900
56X52+56X48
=56×(52+48)
=56×100
=5600
25X(20+4)
=25×20+25×4
=500+100
=600