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用递等式计算,能简算的要简算.(18%)(1)25×12...

(1)25×12-850÷17=25×4×3-50,=300-50,=250;(2)(3.2÷16+10.8)÷22=(0.2+10.8)÷22,=11÷22,=0.5;(3)3.2×12.5×2.5=0.8×4×12.5×2.5,=(12.5×0.8)×(2.5×4),=10×10,=100;(4)7.05-3.84-0.16-1.05=7.05-1.05-(3.84+0.16),=6-4...

0.25×32×1.25 =0.25×4×(8×1.25) =1×10 =10 直接拆开计算

(1)7.9×12.5,=(8-0.1)×12.5,=8×12.5-1×12.5,=100-12.5,=87.5;(2)25.38-1.43-4.38-4.57,=25.38-4.38-1.43-4.57,=(25.38-4.38)-(1.43-4.57),=21-6,=15;(3)90+10÷0.4×2.5,=90+25×2.5,=90+62.5,=152.5;(4)0.8×0.4×(7.6...

(1)14×75-624÷39 =150×7-208÷13,=1050-16,=1034;(2)(7.6-3.6÷2)×1.5=(7.6-1.8)×1.5,=5.8×1.5,=8.7;(3)45-13÷715=45-13×157,=45?57,=335;(4)57÷9+47×19=57×19+47×19,=(57+47)×19,=97×19,=17;(5)23+(56?34)÷38=23+...

(1)(2.5×6+2.5×4)÷5,=2.5×(6+4)÷5,=2.5×10÷5,=25÷5,=5;(2)35.6-2.8+4.4-7.2,=(35.6+4.4)-(2.8+7.2),=40-10,=30;(3)0.25×3.2×12.5,=0.25×4×0.8×12.5,=(0.25×4)×(0.8×12.5),=1×10,=10;(4)7.5÷(1.5+2.5),=7....

①1.25×32×2.5 =(1.25×8)×(2.5×4)=10×10=100;②86.5×2.4÷0.3-690=207.6÷0.3-690=692-690=2;③18.75-6.2-3.8=18.75-(6.2+3.8)=18.75-10=8.75;④3.7×7.3+7.3×6.3=7.3×(3.7+6.3)=7.3×10=73;⑤821×34+712×47=621+721=1321;⑥0.4×7+25×3-0.4×3...

(1)45.07+(4.93+8.62),=45.07+13.55,=58.62;(2)12.5×(80+0.8),=12.5×80+12.5×0.8,=1000+10,=1010;(3)34.26+47.7-55.3+2.53,=34.26+(47.7+2.53)-55.3,=34.26+50.23-55.3,=84.49-55.3,=29.19;(4)13.2-180÷45×2.6,=13.2...

(1)7.06×2.4-5.7,=16.944-5.7,=11.244; (2)5.4×99+5.4,=5.4×(99+1),=5.4×100,=540;(3)9.6×72+9.6×28,=9.6×(72+28),=9.6×100,=960;(4)(1.25×2.5)×4,=1.25×(2.5×4),=1.25×10,=12.5;(5)10.4+72×0.81,=10.4+58.32...

4.67-(2.98+0.67) =4.67-2.98-0.67 =(4.67-0.67)-2.98 =4-2.98 =1.02 73.8x16-73.8x6 =73.8×(16-6) =73.8×10 =738; (5分之4+4分之1)÷3分之7+10分之7 =(16/20+5/20)×(3/7)+7/10 =(21/20)×(3/7)+7/10 =9/20+14/20 =23/20; (1-4分之1-12...

1044-780/0.75+2.25 =1044-1040+2.25 =4+2.25 =6.25 2.63-(0.91+100分之63+100分之9) =2.63-0.63-(0.91+0.9) =2-1.81 =0.19 0.84/8分之1+5分之2*4.2 =0.84×8+0.4×4.2 =0.84×8+8×0.21 =(0.84+0.21)×8 = 1.05×8 =8.4 3分之2*{0.625-(14分之1...

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