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脱式计算(能简算的要简算,并写出主要过程)125×4...

①125×45×16 =(125×8)×(45×2)=1000×90=90000②0.4÷23+1.6÷23 =(0.4+1.6)×32=2×32=3 ③45×27+15÷321 =45×27+15×7=835+4935=5735 ④5.6×38+0.375×5.4-37.5% =5.6×0.375+0.375×5.4-0.375=0.375×(5.6+5.4-1)=0.375×10=3.75 ⑤21-(37+13)×516=21...

(1)808×1.25,=(800+8)×1.25,=800×1.25+8×1.25,=1000+10,=1010;(2)8.6×[1÷(12.1-12.09)],=8.6×[1÷0.01],=8.6×100,=860;(3) 8 15 + ( 4 7 - 1 2 )× 14 25 ,= 8 15 + 1 14 × 14 25 ,= 8 15 + 1 25 ,= 43 75 ;(4)9 1 2 ...

(1)3.58-2.36-(2.64-1.42)=3.58-2.36-2.64+1.42=(3.58+1.42)-(2.36+2.64)=5-5=0;(2)(14+16?13)×12=14×12+16×12-13×12=3+2-4=1;(3)3.6×118+8.4÷811=3.6×118+8.4×118=(3.6+8.4)×118=12×118=332;(4)34÷[3.75×(1.2?15)]=34÷[3.75×1...

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)0.125×0.25×8×4=(0.25×4)×(0.125×8)=1×1=1;(2)54×(56-29 )=54×56-54×29=45-12=33;(3)35×13+35÷113=35×13+35×13=35×(13+13)=35×26=785;(4)8.05-0.75-14=8.05-0.75-0.25=8.05-(0.75+0.25)=8.05-1=7.05.

(1)(125+7)×8,=125×8+7×8,=1000+56,=1056;(2)3.27+6.4+2.73+4.6,=(3.27+2.73)+(6.4+4.6),=6+11,=17;(3)25×44,=25×4×11,=100×11,=1100;(4)6.45-0.58-1.42,=6.45-(0.58+1.42),=6.45-2,=4.45.

(1)37-35+47+0.4=37+47-35+25,=1-35+25,=45;(2)1689÷8=(16+89)×18,=16×18+89×18,=2+19,=219;(3)(6.9-3.15)÷0.3×0.8=3.75÷0.3×0.8,=12.5×0.8,=10;(4)2.5×(1.9+1.9+1.9+1.9)=2.5×(4×1.9),=2.5×4×1.9,=10×1.9,=19.

(1)6×99+25.6,=6×(100-1),+25.6,=6×100-6×1+25.6,=600-6+25.6,=594+25.6,=619.6;(2)4500÷4÷25,=4500÷(4×25),=4500÷100,=45;(3)38.125-(12.125+4.6),=38.125-12.125-4.6,=26-4.6,=21.4;(4)300-(15+420÷21),=300-...

(1)310+4.25+3.7+134=310+3.7+4.25+134=(310+3.7)+(4.25+134)=4+6=10;(2)0.125×3.2×25=0.125×8×0.4×25=(0.125×8)×(0.4×25)=1×10=10;(3)17×44+54×17=17×(44+54)=17×98=14;(4)7.8÷〔32×(1-58)+3.6〕=7.8÷〔32×38+3.6〕=7.8...

(1)10×[34×(710-0.25)];=10×[34×(710-14)];=10×34×920=338;(2)34×318+5.875×75%+0.75=34×318+578×34+1×34=34×(318+578+1)=34×10=712.

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