计算,能简算的要简算:
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| (1)1234+700+300, =1234+(700+300), =1234+1000, =2234; (2)26+(89+74), =26+74+89, =100+89, =189; (3)48×25, =12×4×25, =12×(4×25), =12×100, =1200; (4)85×199+85, =85×(199+1), =85×200, =17000; (5)69×27+27×31, =(69+31)×27, =100×27, =2700; (6)700÷4÷25, =700÷(4×25), =700÷100, =7. |
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