简算 51.5-8.56-1.44 21*102-21*2 25*125*32 7.91*3+3*2.09 45*98+45*2
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简算 51.5-8.56-1.44 21*102-21*2 25*125*32 7.91*3+3*2.09 45*98+45*2
简算 51.5-8.56-1.44 21*102-21*2 25*125*32 7.91*3+3*2.09 45*98+45*2
简算 51.5-8.56-1.44 21*102-21*2 25*125*32 7.91*3+3*2.09 45*98+45*2
51.5-8.56-1.44
=51.5-(8.56+1.44)
=51.5-10
=41.5
21*102-21*2
=21*(102-2)
=21*100
=2100
25*125*32
=25*4*(125*8)
=100*1000
=100000
7.91*3+3*2.09
=(7.91+2.09)*3
=10*3
=30
45*98+45*2
=45*(98+2)
=45*100
=4500
51.5-8.56-1.44 21*102-21*2
=51.5-(8.56+1.44) =21*(102-2)
=51.5-10 ...
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51.5-8.56-1.44 21*102-21*2
=51.5-(8.56+1.44) =21*(102-2)
=51.5-10 =21*100
=41.5 =2100
7.91*3+3*2.09 45*98+45*2
=3*(7.91+2.09) =45*(98+2)
=3*10 =45*100
=30 =4500
25*125*32
=25*4*(125*8)
=100*1000
=100000
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