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计算下列各题(能用简便方法的用简便方法计算)0.1...

(1)18.7-8.8-1.2 =18.7-(8.8+1.2)=18.7-10=8.7;a-b-c=a-(b+c);(2)7.4×9.9+7.4×0.1 =(9.9+0.1)×7.4=10×7.4=74;a×c+b×c=(a+b)×c;(3)8.9×2.5×4=8.9×(2.5×4)=8.9×10=89; a×b×c=a×(b×c);(4)16.81+3.51+6.49 =16.81+(3.51+...

(1)1.08×0.8÷0.27=(1.08÷0.27)×0.8=4×0.8=3.2(2)10.01×101-10.01=10.01×(101-1)=10.01×100=1001(3)0.8×(12.5+0.125)=0.8×12.5+0.8×0.125=10+0.1=10.1(4)2.46÷0.82+33.6=3+33.6=36.6

原式=9.9×2.8+2.8×0.1=2.8×(9.9+0.1)=2.8×10=28 原式=1.1×(10+0.1)=1.1×10+1.1×0.1=11+0.11=11.11

(1)原式=17.92-7.92-0.3 =10-0.3 =9.7 (2)原式=210÷(14×5) =210÷70 =3 (3)原式= × + × =( + )× = (4)原式= ÷( × ) = ×5 =

(1)(1.5-0.375)÷[125×(40%+2.1)]=1.125÷[125×2.5]=1.125÷0.1=11.25;(2)920×1125+1425×920=920×(1125+1425)=920×1=920;(3)[(523-434)÷156]×25%=[1112÷156]×25%=12×25%=18;(4)3.2×1.25+4.8×114=(3.2+4.8)×1.25=8×1.25=10.

(1)0.75×99+0.75=0.75×(99+1),=75;(2)56-(23-16)=56+16-23,=13;(3)(8.5-4)×(0.32÷1.6)=4.5×0.2,=0.9;(4)56×[1÷(78?34)]=56×[1÷18],=56×8,=203;(5)0.925×17+9.25×8.3=9.25×1.7+9.25×8.3,=9.25×(1.7+8.3),=9.25×10...

=564×0.1-364×0.1 =(564-364)×0.1 =200×0.1 =20

(1)15.6-9.2-0.8,=15.6-(9.2+0.8),=15.6-10,=5.6;a-b-c=a-(b+c);(2)390÷15÷2,=390÷(15×2),=390÷30,=13;a÷b÷c=a÷(b×c);(3)38×75-38×55,=38×(75-55),=38×20,=760;a×b-a×c=a×(b-c).

51=17x3 原式=1+1/68=69/68 2. =1.25x9.1x(0.7+0.1)=(1.25x0.8)x9.1=9.1 3. 将各个分数列出可得1+1-1+1

(1)12.25-3.1+0.85-6.17=(12.25+0.85)-3.1-6.17=13.1-3.1-6.17=10-6.17=3.83;(2)(1.9-1.9×0.9)÷(3.8-2.8)=(1.9-1.71)÷(3.8-2.8)=0.19÷1=0.19;(3)2.65×1.7+1.35×1.7=(2.65+1.35)×1.7=4×1.7=6.8;(4)630÷[2.98+6.5×(3.2-3....

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