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12X(7/24+5/6+3/4)简便

=12*7/24+12*5/6+12*3/4 =22.5

=12x(7/24+20/24+18/24)=45/2

12*[7/24+5/6+3/4]=12*7/24+12*5/6+12*3/4=7/2+2*5+3*3=3.5+10+9=22.5

二分之四十五

12x(7/24+5/6+3/4) =12x7/24+12x5/6+12x3/4 =7/2+10+9 =22.5 4x17X(125X34) =4x17x125x2x17 =(4x125x2)x(17x17) =1000x289 =289000 (1/5+3/7)x7X5 =1/5x7x5+3/7x7x5 =7+15 =22

12x(7/24+5/6+3/4) =(7/2)+10+9 =3.5+19 =22.5

12X(7/24+5/6+3/4)=12X7/24+12X5/6+12X3/4=7/2+10+9=3.5+19=22.5

原式=24*5/6+24*3/4=20+18=38

1/:12*(7/24+20/24+18/24) =12*(45/24) =45/2 2/:4/17*34*125 =8*125 =1000 3/:1/5*7*5+3/7*7*5 =7+15 =22

=12*7/24+12*5/6+12*3/4 =7/2+10+9 =22.5

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