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脱式计算(能简便算的要简便算) ...

(1)0.01+1.01×99,=0.01+1.01×(100-1),=0.01+1.01×100-1.01×1,=101+0.01-1.01,=100;(2)26×20.2-8.4-1.8,=26×(20+0.2)-(8.4+1.8),=520+5.2-10.2,=525.2-10.2,=515;(3)89.3×43+38×89.3+893×1.9,=89.3×43+38×89.3+89.3×19,=...

(1)13.6×3-40.6÷2,=40.8-20.3,=20.5;(2) 99×0.75+ 1 4 ×99 ,=99×(0.75+0.25),=99×1,=99;(3) ( 5 6 - 5 8 )×24 ,= 5 6 ×24- 5 8 ×24,=20-15,=5;(4) 121×100 1 121 ,=121×(100+ 1 121 ),=121×100+121× 1 121 ,=12100+1...

(1)900-300÷60=900-5=895;(2)16×30÷40 =480÷40=12;(3)750÷(23+27)=750÷50=15;(4)270÷6÷5 =270÷(6×5)=270÷30=9;(5)720÷4×9 =180×9=1620;(6)210÷35=210÷(7×5)=210÷7÷5=30÷5=6.

①11.23-3.4+8.77-6.6=11.23+8.77-(3.4+6.6)=20-10=10;②5.4÷[0.68÷(1.2-1.03)]=5.4÷[0.68÷0.17]=5.4÷4=1.35;③(3.24×99+3.24)÷8.1 =[3.24×(99+1)]÷8.1=324÷8.1=40;④(18.4-3.75)÷12.5÷0.8=14.65÷12.5÷0.8=14.65÷(12.5×0.8)=14.65÷10...

(1)15×43%+85×0.43=15×0.43+85×0.43,=(15+85)×0.43,=100×0.43,=43;(2) 7 9 ÷ 11 5 + 2 9 × 5 11 = 7 9 × 5 11 + 2 9 × 5 11 ,=( 7 9 + 2 9 )× 5 11 ,=1× 5 11 ,= 5 11 ;(3)( 1 2 - 1 3 )× 3 8 ÷25%=( 3 6 - 2 6 )× 3 8 ÷...

3.6×2.5 =4×0.9×2.5 =(4×2.5)×0.9 =10×0.9 =9

(1)(20-6.9÷0.46)×4.5,=(20-15)×4.5,=5×4.5,=22.5;(2)23×( 5 23 + 2 27 )×27,=23×27× 5 23 +23×27× 2 27 ,=135+46,=181.

2.25×4.8+77.5×0.48=2.25×4.8+7.75×4.8=(2.25+7.75)×4.8=10×4.8=48.

396×123 =(400-4)×123 =49200-492 =48708 3.96×12.3 =(4-0.04)×12.3 =49.2-0.492 =48.708 568+44+32 =(568+32)+44 =600+44 =644 125×768×8 =(125×8)×768 =1000×768 =768000 1.25×76.8×0.8 =(1.25×0.8)×76.8 =1×76.8 =76.8 99×38 =(100-1)×38 =38...

(1)145×9+306÷3=1305+102=1407; (2)(64+56)÷24=120÷24=5;(3)45+240÷40=45+6=51; (4)184×17+63×184=184×(17+63)=184×80=14720;(5)544-166-145=378-145=233;(6)4000÷125÷8=4000÷(125×8)=4000÷1000=4.

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