169乘48-48乘69简便方法?
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用简便计算:149X69-149+149X32,37X99+37,169X123-23X169,129X101-129,56X52+56X48 ,25X(20+4),是用乘法运算定律 149X69-149+149X32=149×(69-1+32)=149×100=1490037X99+37=37×(99+1)=37×100=3700169X123-23X169=169×(123-23)=169×100=16900129X101-129=129×(101-1)=129×100=1290056X52+56X48 =56×(52+48)=56×100=560025X(20+4)=25×20+25×4=500+100=600
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因为两个乘式中都有48,所以运用乘法分配律逆运算就是有48×(169-69)=48×100=4800
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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
=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
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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
=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
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