Question

0.48x0.7-5.2x0.07的简便计算

Answer 1

应该是加吧：
0.48×0.7 +5.2×0.07
= 0.48×0.7 +0.52×0.7
= (0.48+0.52)×0.7
= 1×0.7
= 0.7
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