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脱式计算,能简算的要简算.(1)250×16H048÷24...

(1)496-23×16,=496-368,=128;(2)2.9×3.6+2.9×6.4,=(3.6+6.4)×2.9,=10×2.9,=29;(3)[1-(13+14 )]×24,=[1-712]×24,=512×24,=10.

(1)(14+56)×24=14×24+56×24=6+20=26;(2)3-118+117=178+117=3156;(3)137÷114+247×45+45=137×45+247×45+45=(137+247+1)×45=5×45=4;(4)17.6÷[7.8+0.625×(234-1.15)]=17.6÷[7.8+0.625×1.6]=17.6÷[7.8+1]=17.6÷8.8=2.

(1)678÷116+4.125×16-24÷112=678×16+4.125×16-16=(678+4.125-1)×16=10×16=160;(2)(1325+8×0.17)÷22435.=(1325+1.36)÷22435.=1.88÷22435.=0.7.

(1)(78+34)÷1316=138×1613=2;(2)24×(56-38-14)=24×56-24×38-24×14=20-9-6=5;(3)36×58+36×37.5%=36×(58+37.5%)=36×1=36.

(1)(13+14?124)×24,=13×24+14×24-124×24,=8+6-1,=13;(2)(1+12)×(1-12)×(1+13)×(1-13)×…×(1+19)×(1-19),=32×12×43×23×…×109×89,=12×109,=59;(3)2007×20052006,=(2006+1)×20052006,=2006×20052006+20052006,=200...

(1)(18.6-18.6÷3.1)×1.6,=(18.6-6)×1.6,=12.6×1.6,=20.16,(2)12.5×2.5×3.2,=(12.5×8)×(2.5×0.4),=100×1,=100,(3)4.5÷18=0.25,(4)32.9×0.46+5.4×3.29,=3.29×(4.6+5.4),=3.29×10,=32.9.

1、①6.54×1.2-1.87 =7.848-1.87 =5.978; ②86.4÷0.24+40 =360+40 =400; ③0.46×1.9+0.54×1.9 =1.9×(0.46+0.54) =1.9×1 =1.9; ④13.65÷0.25÷4 =13.65÷(0.25×4) =13.65÷1 =13.65. 2、其中③ ④可以用简便方法。 3、③的简便方法:乘法分配率:(...

(1)153÷45+6.6=3.4+6.6,、=10;(2)(14+18+112)×24=14×24+18×24+112×24,=6+3+2,=11;(3)3.6×[2÷(45?0.6)].=3.6×[2÷(0.8-0.6)],=3.6×[2÷0.2],=3.6×10,=36.

24 +12×8÷6=24 +12÷6×8=24 +2×8=24+16=40

(1)0.48×8.5-3.5,=4.08-3.5,=0.58;(2)100.1×7.4,=(100+0.1)×7.4,=100×7.4+0.1×7.4,=740+0.74,=740.74;(3)1.45×1.02-1.45×0.02,=1.45×(1.02-0.02),=1.45×1,=1.45;(4)24.5×0.8×1.24,=19.6×1.24,=24.304;(5)444×0.25...

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