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3.9*7.8+39*0.12+3.9
=
=
••••••递等式啊!
人气:299 ℃ 时间:2020-09-10 10:16:10
解答
3.9×7.8+39×0.12+3.9
=3.9×7.8+3.9×1.2+3.9×1
=3.9×(7.8+1.2+1)
=3.9×10
=39
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