计算:(1)20 5 23 -2.73-8.27+1 7 13 (2) 5 9 × 7 5 12
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 -2.73-8.27+1 , =(20 +1 )-(2.73+8.27), =21 -11, =10 ; (2) × 7 + × 1 ×5, = × 7 + ×1 , =( 7 + 1 )× , =9× , =5; (3)[(88+ )×1.125-54]÷23%, =[(88+ )×1 -54]÷23%, =[(88× + × )-54]÷23%, =[99+1-54]÷0.23, =46÷0.23, =200; (4)[2 ÷(3 - )×1 ]÷4.02, =[ ÷2 ×1 ]÷4.02, =[ × × ]÷4.02, =1÷4.02, =100÷402, = . |
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