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脱式计算能简便的要简便二点5×4点四怎么简便

2.5×4.4 =2.5×4×1.1 =10×1.1 =11

4.3×1.2×4 =4.3×4.8 =4.3×5-4.3×0.2 =21.5-0.86 =21.5-1+0.14 =20.64

4.8×0.98 =4.8×1-4.8×0.02 =4.8-0.096 =4.704

2.6*(5.3+4.7)=26

6.75×2.4+4.25×2.4-2.4 =(6.75+4.25-1)×2.4 =10×2.4 =24

(1)4.9×4+5.1÷0.25 =4.9×4+5.1÷14 =4.9×4+5.1×4=(4.9+5.1)×4=10×4=40(2)5-34+14=5-(34-14)=5-12=412(3)56+(613-16)-613 =(56-16)+(613-613)=23(4)56-18+16=(56+16)-18 =1-18=78

5*64*25*125=5*(8*8)*25*(25*5)=5*8*8*5*5*5*25*5

(1)0.389×4×0.25,=0.389×(4×0.25),=0.389×1,=0.389;(2)4.02×3.02+4.02×6.98,=4.02×(3.02+6.98),=4.02×10,=40.2;(3)4.05÷0.81+2.4,=5+2.4,=7.4;(4)65.4÷2.5÷4,=65.4÷(2.5×4),=65.4÷10,=6.54;(5)86×9.9,=86×(10...

45÷36=1.25 4.5÷1.8-0.9 =2.5-0.9=1.626.4÷4.4=612.5×3.2 =12.5x8x0.4=100x0.4=40(30.6+1.08)÷0.9 =31.68÷0.9 =35.20.35×14=0.35x2x7=0.7x7=4.9

①2-[1/5+(2/5-5/7)] =2-1/5-2/5+5/7 =7/5+5/7 =49/35+25/35 =74/35; ②(2.5-2.5*0.4)÷4速度啊!! =2.5×(1-0.4)÷4 =2.5×0.15 =0.375 如果本题有什么不明白可以追问,如果满意记得采纳 如果有其他问题请采纳本题后另发点击向我求助,答题不易,...

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