小学四年级下册数学简便运算22*43+22*32+75*18 16*25*125 32*125*25 576-135+224-65 400/128/8
3个回答
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22×43+22×32+75×18 (利用乘法分配率)16×25×125 (结合率)
=22×(43+32﹚+75×18 =(25×2﹚×﹙8×125)
=22×75+75×18 =50×1000
=﹙22+18﹚×75 =50000
=40×75
=3000
32×125×25 (结合率) 576-135+224-65 (加法交换率和结合律)
=﹙125×8﹚×﹙25×4﹚ =﹙576+224﹚-﹙135+65﹚
=1000×100 =800-200
=100000 =600
400/128/8 (除法运算定律)
=400÷128÷8
=400÷8÷128
=50÷128
=25/64
=22×(43+32﹚+75×18 =(25×2﹚×﹙8×125)
=22×75+75×18 =50×1000
=﹙22+18﹚×75 =50000
=40×75
=3000
32×125×25 (结合率) 576-135+224-65 (加法交换率和结合律)
=﹙125×8﹚×﹙25×4﹚ =﹙576+224﹚-﹙135+65﹚
=1000×100 =800-200
=100000 =600
400/128/8 (除法运算定律)
=400÷128÷8
=400÷8÷128
=50÷128
=25/64
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22*43+22*32+75*18
=22*(43+32)+75*18
=22*75+75*18
=75*(22+18)
=75*40
=3000
16*25*125
=4*25*4*125
=100*500
=50000
32*125*25
=8*125*4*25
=1000*100
=100000
576-135+224-65
=576+224-(135+65)
=800-200
=600
400/128/8
=400÷8÷128
=50÷128
=25/65
=22*(43+32)+75*18
=22*75+75*18
=75*(22+18)
=75*40
=3000
16*25*125
=4*25*4*125
=100*500
=50000
32*125*25
=8*125*4*25
=1000*100
=100000
576-135+224-65
=576+224-(135+65)
=800-200
=600
400/128/8
=400÷8÷128
=50÷128
=25/65
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这道题太坑人了吧……
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