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数学
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3.2*1.8+2.54和198*0.51简便运算
人气:464 ℃ 时间:2019-11-16 14:54:20
解答
3.2*2-3.2*0.2+2.54
=6.4-0.64+1.9+0.64
=6.4+1.9
=8.3
198*0.51
=198*0.5+198*0.01
=99+1.98
=100.98
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