题目内容
【题目】脱式计算。(能简算的要简算)
9.9×9+9.9
0.63×101
2.73×0.5×6
(12.5+1.1)×0.8
3.7×8.3+0.83×63
【答案】99;63.63;8.19;10.88;83
【解析】
9.9×9+9.9
=9.9×(9+1)
=99
0.63×101
=0.63×(100+1)
=0.63×100+0.63×1
=63.63
2.73×0.5×6
=2.73×(0.5×6)
=8.19
(12.5+1.1)×0.8
=12.5×0.8+1.1×0.8
=10+0.88
=10.88
3.7×8.3+0.83×63
=3.7×8.3+6.3×8.3
=(3.7+6.3)×8.3
=10×8.3
=83
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