50×61-62x48简便计算?
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50×61-62×48
=50×61-62×(50-2)
=50×61-(62×50-62×2)
=51×61-62×50+62×2
=50×(61-62)+122
=-50+122
=72
=50×61-62×(50-2)
=50×61-(62×50-62×2)
=51×61-62×50+62×2
=50×(61-62)+122
=-50+122
=72
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50*61-62*48
=50×61-61x48-48
=61*(50-48)-48
=61*2-48
=122-50+2
=74
=50×61-61x48-48
=61*(50-48)-48
=61*2-48
=122-50+2
=74
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