99.9×98+(0.8-3/5)×999,3/5是五分之三

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99.9×98+(0.8-3/5)×999,3/5是五分之三99.9×98+(0.8-3/5)×999,3/5是五分之三99.9×98+(0.8-3/5)×999,3/5是五分之三99.9×98+(0

99.9×98+(0.8-3/5)×999,3/5是五分之三
99.9×98+(0.8-3/5)×999,3/5是五分之三

99.9×98+(0.8-3/5)×999,3/5是五分之三
99.9×98+(0.8-3/5)×999
=99.9×98+0.2×999
=999×9.8+999×0.2
=999×(9.8+.0.2)
=9990
您的问题已经被解答~(>^ω^

99.9×98+(0.8-3/5)×999
=99.9×98+0.2×999
=999×9.8+999×0.2
=999×(9.8+.0.2)
=9990

原式=999*9.8+0.2*999
=999*(9.8+0.2)
=999*10
=9990

999*9.8+0.2*999
999*(9.8+0.2)=9990

原式=(100-0.1)×98+(0.8-0.6)×(1000-1)
=9800-9.8+200-0.2
=10000-10
=9990

99.9×98+(0.8-3/5)×999
=(100-0.1)+(100-2)+0.2×999
=10000-200-10+0.2+0.2×999
=9790+0.2×(1+999)
=9790+200
=9990

(100-0.1)×98+(0.8-0.6)×(1000-1)
=9800-9.8+0.2×(1000-1)
=9800+200-9.8-0.2
=10000-10
=9990

(100-0.1)*(100-2)+(0.8-0.6)*(1000-1)=10000-210+0.2+0.2*1000-0.2=10000-210+200=9990

999*(0.1*98+0.8-0.6)=999*(9.8+0.2)=9990

99.9×98+(0.8-3/5)×999,3/5是五分之三 三道用简便算法的算式,(1) 1990-1985+1980-1975+1970-1965+…+20-15+10(2) 100+99+98-97-96-95+…+10+9+8-7-6-5以(100+99+98-97-96-95)6个数为一组(3)1-2+3-4+5-6+ 1-2+3-4+5-6+7-8~-98+99 简便运算1+3+5+……+99-(2+4+6+……98) 简算1-2+3-4+5-6+7-8+…+95-96+97-98+99 此题能这样解:1+2-3+4-5+6-…-98+99=(99-98+97-96)+(95-94+93-92)+……+(7-6+5-4)+(3-2+1-0)=2×25=50 (1+3+5+7+……+99+101)-(2+4+6+8+……+98+100)怎么写 100-99+98-97+96……-5+4-3+2-1=? .100×101-99×100+98×99-97×98+96×97-95×96+…+4×5-3×4+2×3-1×2如何做请教具体计算 100+99-98+97-96+…+3-2+1 数学题(数奥)2+3-4+5+6-7+8+9-10+.+98+99-100= 写详细点 计算:(+1)+(-3)+(+5)+(-7)+⋯+(+97)+(-99) 100+99-98-97+96+95⋯+4+3-2-1 帮我做下一道六年级简便运算题目99.9×98+(0.8-3/5)×999 计算1+2-3+4+5-6+7+8-9+一直到+97+98-99+100=? 计算.(能简算的要简算) 1)(5/6×10.68+8.52×5/6)÷1又3/5 2) (2/39+5/27)×27×393) 98/99×974) 12又1/2-7.6-2.4+1/2 五年级数学 1、用简便方法计算, (1)8.56×2.7+1.44×2.7 (2) 1.25×2.5×4×0.8(3)5.74×99+5.74 (4)72×0.03+0.3×2.82、计算下列各题.(5)9÷[(38.02+1.98)×0.5] (6)1.2×(3.2-2.99÷2.3)(7)(1 一道数学题 小学的很简单 速度100+99-98-97+96+95-94-93+…+8+7-6-5+4+3-2-1=?