2.84x(8.5-1.2)简便计算?
1个回答
2.84×(8.5-1.2)
=2.84×7.3
=2.84 ×7+2.84×0.3
=19.88+0.852
=19.88+0.12+0.732
=20+0.732
=20.732
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