数学简便计算,脱式的
102×45-0.9的简便运算。
很急用!10分钟要收到,有悬赏的,放心吧!
102x45-0.9
=45x(100+2)-0.9
=45x100+45x2-0.9
=4500+90-0.9
=4589.1
或者:
102x45-0.9
=102x5x9-0.9
=510x9-0.9
=4590-0.9
=4589.1
102*45-0.9
=(100+2)*45-0.9
=100*45+2*45-0.9
=4500+90-0.9
=4590-0.9
=4589.1
102*45-0.9
=(100+2)*45-0.9
=100*45+2*45-0.9
=4500+90-0.9
=4589.1
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