题目

用简便方法计算。 ①16.3×9+16.3 ②98×0.51 ③1.25×16×2.5 ④（0.8+8）×12.5 ⑤5.2×10.1 ⑥2.5×3.7+63×0.25 答案：①16.3×9+16.3=16.3×（9+1）=16.3×10=163②98×0.51=（100-2）×0.51=100×0.51-2×0.51=51-1.02=49.98③1.25×16×2.5=1.25×（8×2）×2.5=（1.25×8）×（2×2.5）=10×5=50④（0.8+8）×12.5=0.8×12.5+8×12.5=10+100=110⑤5.2×10.1=5.2×（10+0.1）=5.2×10+5.2×0.1=52+0.52= 52.52⑥2.5×3.7+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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