2.73+8.27
计算:(1)20523-2.73-8.27+1713(2)59×7512+19×1712×5(3)[(88+89)×1.125-54]÷23%(4)[249÷(325-1...
计算: (1)20 5 23 -2.73-8.27+1 7 13 (2) 5 9 × 7 5 12 + 1 9 × 1 7 12 ×5 (3)[(88+ 8 9 )×1.125-54]÷23% (4)[2 4 9 ÷(3 2 5 - 11 15 )×1 1 11 ]÷4.02.
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(1)20 5 23 -2.73-8.27+1 7 13 , =(20 5 23 +1 7 13 )-(2.73+8.27), =21 226 299 -11, =10 226 299 ; (2) 5 9 × 7 5 12 + 1 9 × 1 7 12 ×5, = 5 9 × 7 5 12 + 5 9 ×1 7 12 , =( 7 5 12 + 1 7 12 )× 5 9 , =9× 5 9 , =5; (3)[(88+ 8 9 )×1.125-54]÷23%, =[(88+ 8 9 )×1 1 8 -54]÷23%, =[(88× 9 8 + 8 9 × 9 8 )-54]÷23%, =[99+1-54]÷0.23, =46÷0.23, =200; (4)[2 4 9 ÷(3 2 5 - 11 15 )×1 1 11 ]÷4.02, =[ 22 9 ÷2 2 3 ×1 1 11 ]÷4.02, =[ 22 9 × 3 8 × 12 11 ]÷4.02, =1÷4.02, =100÷402, = 50 201 .
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