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3.09减去1.15与

【3.09-(1.15+3/20)】x10/100 =[3.09-1.3]x10/100 =1.79x10/100 =0.179

人是需要进步的,新年好! 1.15+1/12=23/20+1/12=69/60+5/60=74/60=37/30 37/12÷37/30=5/2=2.5 3.09-2.5=0.59 0.59×10%=0.059

1.15 × 0.07 = 0.0805≈0.08 3.09 × 0.6 = 1.854≈1.85 竖式见图:

0.844÷1.7=0.49647058823529411764705882352941 36÷25=1.44 3.09÷0.15=20.6 10.42÷2.6=4.0076923076923076923076923076923

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