| 脱式计算: 8×3889×125 224×25-25×24 76×298+76×3-76 630×〔840÷(240-212)〕 〔458-(85+28)〕÷23. |
| 8×3889×125, =8×125×3889, =1000×3889, =3889000; 224×25-25×24, =25×(224-24), =25×200, =5000; 76×298+76×3-76, =76×(298+3-1), =76×300, =22800; 630×〔840÷(240-212)〕, =630×(840÷28), =630×30, =18900; [458-(85+28)]÷23, =(458-85-28)÷23, =345÷23, =15. |
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a.12×(4+25)[ ]
a. 47+(14×5)(1)35+65=
65+35=
35+65○65+35