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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,=...

3.8*0.25+2.05=1.9*2*0.25+2.05=1.9*0.5+2.05=0.95+2.05=3 1.25*99=1.25*(100-1)=1.25*100-1.25=125-1.25=123.75

(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,...

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)(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.

396X123=(400一4)x123=49200一492=48708 3.96X12.3=(14-0.04)12.3=49.2-0.492=48.708 68+44+32=68+32+44=100+44=144 125X764X8=125X8X764=1000x764=764000 1.25X76.4X0.8=1.25X0.8X76.4=1.25X0.8x76.4=1X76.4=76.4 99X38=(100-1)X38=3800-38=376...

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

(1)62×7.1+2.9,=440.2+2.9,=443.1;(2)4.2×0.25,=(4+0.2)×0.25,=4×0.25+0.2×0.25,=1+0.05,=1.05;(3)5.2×4.3+0.8×4.3,=(5.2+0.8)×4.3,=6×4.3,=25.8.

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. (10-1÷25)÷99.6÷0.01 = (10-1÷25)÷99.6÷1/100 = (10-1/25)÷99.6×100 = (10×100-1÷25×100)÷99.6 =(1000-4)/99.6 =(1000-4)/(100-0.4) =((1000-4)×100)/((100-0.4)×100) =((1000-4)×100)/(1000-4) =10 2.(1/8-1/9...

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