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脱式计算,能简便计算的要简算. (1)13÷0.4÷...

(1)13÷0.4÷2.5,=13÷(0.4×2.5),=13÷1,=13;(2)64×4.5+36×4.5,=(64+36)×4.5,=100×4.5,=450;(3)1.25×2.5×0.8,=1.25×0.8×2.5,=1×2.5,=2.5;(4)1.5×101-1.5,=1.5×(101-1),=1.5×100,=150;(5)14.64+3.7×2.8,=14.64+10....

7.2/0.25/0.4 =7.2/(0.25x0.4) =7.2/0.1 =72 如有帮助请采纳, 如对本题有疑问可追问,Good luck!

2.1除以2.5再除以0.4脱式简便运算 2.1÷2.5÷0.4 =2.1÷(2.5x0.4) =2.1÷1 =2.1

(1)1.08×0.8÷0.27=1.08÷0.27×0.8,=4×0.8,=3.2;(2)102×0.45=(100+2)×0.45,=100×0.45+2×0.45,=45+0.9,=45.9;(3)22.78÷1.25÷0.8=22.78÷(1.25×0.8),=22.78÷1,=22.78;(4)0.34×101-0.34=(101-1)×0.34,=100×0.34,=34.

(1)6.72-2.3÷0.5×0.8=6.72-4.6×0.8=6.72-3.68=3.04;(2)98-17+18-67=(98+18)-(17+67)=54-1=14;(3)910÷[12×(65-310)]=910÷[12×910]=910÷920=2;(4)(27+15)×7×5=27×7×5+15×7×5=10+7=17.

17.6÷0.4÷1.76 = 17.6/1.76/0.4 =10/0.4 =25

脱式计算能简算的要简算 0.25x32x12.5 =(0.25×4)×(8×12.5) =1×100 =100 2/5x68+0.4x32 =0.4×(68+32) =0.4×100 =40 14/5÷(14/5+7/10) =14/5÷7/2 =4/5 (2/3+4/15x5/6)÷10/21 =(2/3+2/9)÷10/21 =8/9÷10/21 =28/15 1-5/8÷25/28-3/10 =1-...

(1)15.64-2.53-7.47=15.64-(2.53+7.47),=15.64-10,=5.64;(2)3.7+6.3÷0.6-0.4=3.7+10.5-0.4,=13.8;(3)3.5÷[(0.45-0.38)×0.1]=3.5÷[0.07×0.1],=3.5÷0.007,=500;(4)5.6×7.2+4.4×7.2=(5.6+4.4)×7.2,=10×7.2,=72.

(1)1.24×9+1.24 =1.24×(9+1) =1.24×10 =12.4 (2)2.88÷4.8-0.4 =0.6-0.4 =0.2

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