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脱式计算,(能简算的简算) 201×0.65%0.65 3...

(1)201×0.65-0.65,=(201-1)×0.65,=200×0.65,=130;(2)3.6×0.7×2.5,=4×0.9×0.7×2.5,=(0.9×0.7)×(2.5×4),=0.63×10,=6.3;(3)6.44×3.7+6.44×6.3,=6.44×(3.7+6.3),=6.44×10,=64.4;(4)1.25×39.5×0.8,=(1.25×0.8)×39.5...

(1)201×0.65-0.65,=(201-1)×0.65,=200×0.65,=130;(2)3.6×0.7×2.5,=4×0.9×0.7×2.5,=(0.9×0.7)×(2.5×4),=0.63×10,=6.3;(3)6.44×3.7+6.44×6.3,=6.44×(3.7+6.3),=6.44×10,=64.4;(4)1.25×39.5×0.8,=(1.25×0.8)×39.5...

(1)0.8×(3.2-2.3÷2.3),=0.8×(3.2-1),=0.8×2.2,=1.76;(2)3.65×4.7-36.5×0.47,=36.5×0.47-36.5×0.47,=0.

(1)46×8-120÷15,=368-8,=360;(2)[6.85-(0.65+0.7)]÷2.5,=[6.85-0.65-0.7]÷2.5,=[6.2-0.7]÷2.5,=5.5÷2.5,=2.2;(3) 7 12 ÷9+ 1 9 × 5 12 ,= 7 12 × 1 9 + 1 9 × 5 12 ,=( 7 12 + 5 12 )× 1 9 ,=1× 1 9 ,= 1 9 ;(4)5.58-...

(0.125×8-0.5)×4 =(1-0.5)*4=0.5*4=2 105×8.6-8.6×4-8.6=(105-4-1)*8.6=100*8.6=860 1.8+18÷1.5-0.5×0.3 =1.8+12-0.15=13.65 (0.62+7.638÷0.1)÷0.25=(0.62+76.38)/0.25=77/0.25=308

(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],...

①62.4×15-66.95÷65 =936-1.03=934.97; ②12.5×25×0.32=(12.5×0.8)×(25×0.4)=10×10=100; ③5.8×2.8+2.8+3.2×2.8=2.8×(5.8+1+3.2)=2.8×10=28.

(1)20.9+10.5÷(5.2-3.5)=20.9+10.5÷1.7=20.9+6317=2713170;(2)3.5×0.7+5.5×0.7+0.7=(3.5+5.5+1)×0.7=10×0.7=7;(3)10.64+7.65×2.4+11.76=10.64+18.36+11.76=29+11.76=40.76;(4)6.2×9.9=6.2×(10-0.1)=6.2×10-6.2×0.1=62-0.62=61....

原式等于 65÷(2.5×0.08) =65÷0.2 =325 所以原式的计算结果为325.

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