(1)0.4×[ ÷2 ×(4.3-1.8)] (2)23.3×(2-75%)+(1+25%)×27.7-3×1 (3)3.14-6.28+9.

2024-11-24 00:07:26
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回答1:

(4)原式= 42×( + + + + +
                = ×(1+ + + + +
                = ×(21+7+ + + +1)
                = ×36
                =9