几道的简便计算题9999X7778+3333X6666 5.6X69.32+138.64X0.05+693.2X0.43
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几道的简便计算题
9999X7778+3333X6666 5.6X69.32+138.64X0.05+693.2X0.43=?1234567891的平方—1234567890X1234567892=?362+543X361———————=?362X548—186
9999X7778+3333X6666 5.6X69.32+138.64X0.05+693.2X0.43=?1234567891的平方—1234567890X1234567892=?362+543X361———————=?362X548—186
9999X7778+3333X6666
=9999×7778 +3333×3×2222
=9999×(7778 +2222)
=9999×10000
=99990000
5.6X69.32+138.64X0.05+693.2X0.43
= 5.6X69.32+69.32×2X0.05+69.32X4.3
=69.32×(5.6+0.1+4.3)
=69.32×10
=693.2
1234567891²—1234567890X1234567892
=1234567891²—1234567890X(1234567891+1)
=1234567891²—1234567891×1234567890—1×1234567890
=1234567891×(1234567891—1234567890)—1234567890
=1234567891—1234567890
=1
最后一题没看懂
=9999×7778 +3333×3×2222
=9999×(7778 +2222)
=9999×10000
=99990000
5.6X69.32+138.64X0.05+693.2X0.43
= 5.6X69.32+69.32×2X0.05+69.32X4.3
=69.32×(5.6+0.1+4.3)
=69.32×10
=693.2
1234567891²—1234567890X1234567892
=1234567891²—1234567890X(1234567891+1)
=1234567891²—1234567891×1234567890—1×1234567890
=1234567891×(1234567891—1234567890)—1234567890
=1234567891—1234567890
=1
最后一题没看懂
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