Question

用简便方法计算下列各题:2010÷15-11x12,630÷18,810÷18,560÷16,7

8x72

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Answer 1

2010÷15-11x12
=402÷3-(10+1)x12
=134-(10x12+1x12)
=134-(120+12)
=134-120-12
=14-12
=2

630÷18
=210÷6
=70÷2
=35

810÷18
=90÷2
=45

560÷16
=70÷2
=35

78×72
=（70+8）×（80-8）
=70×80-70×8+8×80-8×8
=5600-560+640-64
=5600+（640-560）-64
=5600+80-64
=5600+（80-64）
=5600+16
=5616

Answer 2

2010÷15-11x12
=402÷3-(10+1)x12
=134-(10x12+1x12)
=134-(120+12)
=134-120-12
=14-12
=2