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7.2+28.7÷0.7(递等式计算)

7.2+28.7÷0.7 =7.2+41 =48.2 没有简算,直接计算

解: 7.2×63+28×6.3 =7.2×63+2.8×63 =(7.2+2.8)×63 =10×63 =630

①28.49÷7.4×0.32=3.85×0.32=1.232;②(514÷1.25+112)×13-0.975=(4.2+1.5)×13-0.975=5.7×13-0.975=1.9-0.975=0.925;③(0.2+13)÷23÷0.6=815×32×53=43;④[(615-0.45)÷1518]÷(113÷6)=[234÷1518]÷29=92×92=814.

56.8×35.7+56.8×28.5+64.2×43.2=56.8×(35.7+28.5)+64.2×43.2=56.8×64.2+64.2×43.2=64.2×(56.8+43.2)=64.2×100=6420

①28.7÷7+4.5 =4.1+4.5=8.6; ②3.6÷0.4-1.2×5=9-6=3;③2.6+1.4×3=2.6+4.2=6.8;④0.4+96÷(14.6-11.4)=0.4+96÷3.2=0.4+30=30.4.

(1)72-3×8÷6=72-24÷6=72-4=68;(2)36.5×(28-5)=36.5×23=839.5;(3)(450+2.7)×(2.1-1.8)=452.7×0.3=135.81;(4)86.7-(14.3+3.8)=86.7-18.1=68.6;(5)60×(12.87+0.75)=60×13.62=817.2;(6)95.6-(26.3-8.3)=95.6-18=77.6.

846÷7=120…6;347÷3=115…2;?437÷6=72…5验算:;⊙650÷5÷2=130÷2=65;⊙576×3÷4=1728÷4=432;⊙285+115÷5=285+23=308.

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