题目内容

【题目】用简便方法计算。

①16.3×9+16.3

②98×0.51

③1.25×16×2.5

0.8+8×12.5

⑤5.2×10.1

⑥2.5×3.7+63×0.25

【答案】①163

②49.98

③50

④110

⑤52.52

⑥25

【解析】

①16.3×9+16.3

=16.3×9+1

=16.3×10

=163

②98×0.51

=100-2×0.51

=100×0.51-2×0.51

=51-1.02

=49.98

③1.25×16×2.5

=1.25×8×2×2.5

=1.25×8×2×2.5

=10×5

=50

0.8+8×12.5

=0.8×12.5+8×12.5

=10+100

=110

⑤5.2×10.1

=5.2×10+0.1

=5.2×10+5.2×0.1

=52+0.52

=52.52

⑥2.5×3.7+63×0.25

=2.5×3.7+6.3×2.5

=2.5×3.7+6.3

=2.5×10

=25

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