1200-28*14怎样简便运算
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1200-28*14怎样简便运算
1200-28*14
=4*(300-7*14)
=4*2*(150-7*7)
=8*(150-49)
=8*101
=808
1200-28*14
=8*150-4*7*2*7
=8*150-4*2*7*7
=8*150-8*49
=8*(150-49)
=8*101
=808
=1200-(4*7)*(2*7)
=1200-4*2*7^2
=1200-8*49
=1200-8*(40+9)
=1200-8*40-8*9
=1200-320-72
=680-72
=608