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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)0.125×8.75×8=0.125×8×8.75=1×8.75=8.75;(2)1.8÷0.5÷0.6=1.8÷(0.5×0.6)=1.8÷0.3=6;(3)12.75÷[14.6-(1.3+8.2)]=12.75÷[14.6-9.5]=12.75÷5.1=2.5;(4)0.7×10.1=0.7×(10+0.1)=0.7×10+0.7×0.1=7+0.07=7.07;(5)0.5x-7=28 0.5x-...

(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)4.05÷0.5+10.75=8.1+10.75=18.85(2)21.6÷0.8-1.2×5=27-6=21(3)6.8×2.7+2.7×3.2=(6.8+3.2)×2.7=10×2.7=27(4)8.4×6.9÷(6.44-4.14)=8.4×6.9÷2.3=8.4×(6.9÷2.3)=8.4×3=25.2(5)0.38×102 =0.38×(100+2)=0.38×100+0.38×2 =38+0.76...

(1)0.8×3.9×1.25=0.8×1.25×3.9=1×3.9=3.9;(2)3.6×10.1=3.6×(10+0.1)=3.6×10+3.6×0.1=36+0.36=36.36;(3)4.8×1.25=6×0.8×1.25=6×(0.8×1.25)=6×1=6;(4)4.87×2.34+48.7×0.266=4.87×2.34+4.87×2.66=4.87×(2.34+2.66)=4.87×5=24.35.

(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...

(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)3.25×0.45+6.75×0.45=(3.25+6.75)×0.45=10×0.45=4.5;(2)9.07-22.78÷3.4=9.07-6.7=2.37;(3)7.5×102=7.5×(100+2)=7.5×100+7.5×2=750+15=765;(4)5.64÷0.125÷8=5.64÷(0.125×8)=5.64÷1=5.64;(5)16×0.7×2.5=4×4×0.7×2.5=(4×0....

(1)450+450÷18,=450+25,=475;(2)(0.64÷16+1.06)÷22,=(0.04+1.06)÷22,=1.1÷22,=0.05;(3)514÷[67×(49+16)],=514÷[67×1118],=514÷1121,=514×2111,=1522;(4)49×14+59×25%+1÷4,=49×0.25+59×0.25+0.25,=0.25×(49+59+1)...

①25×14+75÷4=25×14+75×14,=(25+75)×14,=100×14,=25;②1÷27×2627=1×72×2627,=9127;③(25-13)÷56=115×65,=225;④4.32+310+0.68+710=(4.32+0.68)+(310+710),=5+1,=6.

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