13.8×9.9简便方法算式
13.8×9.9简便方法算式
原式
=13.8*10-13.8*0.1
=138-1.38
=136.62
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简便方法算 算式111
33333×66666+77778×99999
=33333×3×22222+77778×99999
=99999×22222+77778×99999
=99999×(77778+22222)
=99999×10000
=999990000
9.9×128 9.9×87 9.9用简便方法算
9.9×128+9.9×87+9.9
=9.9×(128+87+1)
=9.9×216
=(10-0.1)×216
=2160-21.6
=2138.4
9.98×9.9用简便方法算
9.98×9.9
=9.98×(10-0.1)
=9.98×10-9.98×0.1
=99.8-0.998
=98.802
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39 52 161 42简便方法算式
39+ 52 +161 +42
=39+161+52+42
=200+94
=294
7200除120的简便方法算式
7200÷120
=7200÷(20×6)
=7200÷20÷6
=360÷6
=60
98×23加46简便方法算式托式
98×23加46简便方法算式托式
=98x23+2x23
=23x(98+2)
=23x100
=2300
4.5x8.3=?简便方法算式
4.5×8.3
=﹙4+0.5﹚×﹙8+0.3﹚
=4×8+4×0.3+0.5×8+0.5×0.3
=32+1.2+4+0.15
=37.35
1.24+9.9×12.4用简便方法算
1.24+9.9×12.4
=1.24+99×1.24
=(1+99)×1.24
=100×1.24
=124
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