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630除以40简便方法

630÷40=63/4=(60+3)/4=15+3/4=15又3/4

630÷45的简便方法计算630÷45=630÷90*2=7*2=14

630除以45的简便方法:(除法没有分配律)630÷45 =630÷(9*5) =630÷9÷5 =70÷5 =14 乘法分配律:630÷45 =630* 1/45 =630*(1/9*1/5) =(630*1/9)*1/5 =70*1/5 =(50+20)*1/5 =50*1/5+20*1/5 =10+4 =14

630÷42 =630÷(7*6) =630÷7÷6 =90÷6 =15

630除以45的脱式简便算法的过程是:630÷45=(90*7)÷45=90÷45*7=2*7=14 解题分析:两个整数相除,因为经过观察,除数45的倍数90正好是被除数630的因数,所以可以考虑将630拆成90*7的形式来简便计算,因为乘法和除法在式子中的运

630*45=630*(50-5)=630*50-630*5=31500-3150=28350

630除以42 =630÷(7*6) =630÷7÷6 =90÷6 =15

45=3*3*5630=2*3*3*5*7=(2*7)*(3*3*5) 所以630÷45=(2*7)*(3*3*5)÷(3*3*5)=2*7=14

630除以20用简便方法计算=63÷2=31.5

630/50=63/5

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