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脱式计算.(能简算的要简算,并写出主要的简便过...

①(84×27-2166)÷17,=(2268-2166)÷17,=102÷17,=6;②115×3.7+5.3÷511+2.2,=2.2×3.7+5.3×2.2+2.2,=2.2×(3.7+5.3+1),=2.2×10,=22;③(0.75÷3-0.1)×(1-23),=(0.25-0.1)×13,=0.15×13,=0.05.

(1)3637×36=3637×(37-1)=3637×37-3637=36-3637=35137;(2)1312÷(1312+2)=1312÷3712=1312×1237=1337;(3)(111+999)÷[56×(37-38)]=1110÷[56×37-56×38]=1110÷[24-21]=1110÷3=370.

(1)8.85-3.38+1.15-4.62,=(8.85+1.15)-(3.38+4.62),=10-8,=2;(2)[1-( 1 8 + 5 16 )] ÷ 1 8 ,=[1- 7 16 ] ÷ 1 8 ,= 9 16 ×8,= 9 2 ;(3)45×( 7 9 + 4 15 - 3 5 ),=45× 7 9 +45× 4 15 -45× 3 5 ,=35+12-27,=20;(4)2.4...

第一题=3/4乘以5/7乘以4/3减去1/2=5/7减去1/2=分子:10减去7 分母:14=3/14 第二题=3.14乘以16减去3.14乘以6=3.14乘以(16减去6)=3.14乘以10=31.4 第三题=10减去【1/5减去(7/20减去1/10)乘以1/5】=10减去1/5乘以【1减去(7/20减去1/10)】=10...

(1)2.5×7.1×4=(2.5×4)×7.1=10×7.1=71(2)16.12×99+16.12 =16.12×(99+1)=16.12×100=1612(3)5.2×0.9+0.9×4.8=(5.2+4.8)×0.9=10×0.9=9(4)26×15.7+15.7×24 =(26+24)×15.7=50×15.7=785(5)(2.275+0.625)×0.28=2.9×0.28=0.812(6)6...

3.6×1.02 =3.6×1+3.6×0.02 =3.6+0.072 =3.672 乘法分配率

(1)7.5×2.3+1.9×2.5=17.25+4.75=22;(2)(78.6-0.786×25十75%×21.4)×2011÷75,=(78.6-78.6×0.25+75%×21.4)×2011÷75,=[(1-0.25)×78.6+0.75×21.4]×2011÷75,=[0.75×78.6+0.75×21.4]×2011÷75,=(78.6+21.4)×0.75×2011÷75,=100×0.75×20...

2/7x1.6÷(10-7/8÷3/16) =2/7x1.6÷(10-14/3) =2/7x1.6÷16/3 =2/7x3/10 =3/35

(8/9-1/3)÷(7/18×2/3) =(8/9-1/3)÷7/27 =8/9×27/7-1/3×27/7 =24/7-9/7 =15/7 =2又1/7

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