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脱式计算,能简算的要简算(1)5.6÷0.14÷4; ...

(1)13.4+5.62+17.6+4.38,=(13.4+17.6)+(5.62+4.38),=31+10,=41.(2)3.4÷[(1.2+0.5)×5],=3.4÷[1.7×5],=3.4÷8.5,=0.4.(3)0.75×18÷0.15,=13.5÷0.15,=90.(4)2.5×3.2×1.25,=(2.5×0.4)×(8×1.25),=1×10,=10.

(1)17.64÷4.9+6.73=3.6+6.73=10.33(2)5.6×13.9+0.44×139=0.56×139+0.44×139=(0.56+0.44)×139=1×139=139(3)48×1.02÷3.4=48.96÷3.4=14.4(4)0.25×12.5×320=0.25×12.5×8×40=(0.25×40)×(12.5×8)=10×100=1000

(1) 4 5 - 4 5 ÷ 2 3 × 1 2 = 4 5 - 4 5 × 3 2 × 1 2 = 4 5 - 3 5 = 1 5 ;(2)( 2 3 + 4 15 )×15= 14 15 ×15=14;(3)12.87+3.65+1.35=12.87+(3.65+1.35)=12.87+5=17.87;(4)74.6×19+19×25.4=(74.6+25.4)×19=100×19=1900;(5)【...

①1315÷(14+25),=1315÷1320,=43;②3÷34?34÷3,=4-14,=334;③125×(56+34)+15,=125×56+125×34+15,=2+95+15,=2+(95+15),=2+2,=4;④98%×981+0.02×981,=(98%+0.02)×981,=1×981,=981.

(8)84+27×84+y7÷4,=84+27×84+y7×84,=(8+27+y7)×84,=2×84,=82;(2)82.4-2.4×3.7y÷2.y,=82.4-七÷2.y,=82.4-3.6,=8.8;(3)2.y×2y-0.28÷83+七.63,=8-0.63+七.63,=8+(七.63-0.63),=8+七,=80;(4)8七七七+七七七×七七七,=8000...

(1)(12.5+7.5)÷0.25 =20÷0.25=80(2)2÷85×254=2×58×254=71316(3)13.1×56+5.6×69=131×5.6+5.6×69=5.6×(131+69)=5.6×200=1120(4)2.8+[2.4÷(90-60)]=2.8+[2.4÷30]=2.8+0.08=2.88

①2.55÷1.7-0.59=1.5-0.59=0.91; ②3.7×7.9+3.7×2.1 =3.7×(7.9+2.1)=3.7×10=37;③37×﹙45-23)÷514 =37×215×145 =425;④34×93+6×0.75+75%=0.75×93+6×0.75+0.75=0.75×(93+6+1)=0.75×100=75.

(1)72.8÷5.6+1.49,=13+1.49,=14.49;(2)58.1-29.7÷3,=58.1-9.9,=48.2;(3)30.94-5.09-4.91,=30.94-(5.09+4.91),=30.94-10,=20.94;(4)3.94+34.3×0.2,=3.94+6.86,=10.8;(5)5.4×2.3+5.4×7.7,=5.4×(2.3+7.7),=5.4×10,=5...

(1)8470-104×65,=8470-6760,=1710;(2)168.1÷(4.3×2-0.4),=168.1÷(8.6-0.4),=168.1÷8.2,=20.5;(3)(4÷7+15)×5-197,=(47+15)×5-197,=207+1-197,=207-197+1,=17+1,=117;(4)1110÷[56×(37-38)],=1110÷[56×37-56×38],...

(1)1.6×55.4-55.4×0.6-55.4,=(1.6-0.6-1)×55.4,=0×55.4,=0;(2)17.68÷5.2+2.7×1.5,=3.4+4.05,=7.45;(3)4.8×0.25,=(1.2×4)×0.25,=1.2×(4×0.25),=1.2×1,=1.2.

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