计算,能简算的要简算10÷0.2÷2.5 64×4.5+3.6×4
计算,能简算的要简算10÷0.2÷2.564×4.5+3.6×451.25×3.2×0.814.5×1028.4÷0.21÷0.50.8×[(5-0.68)÷1.2]....
计算,能简算的要简算10÷0.2÷2.5 64×4.5+3.6×45 1.25×3.2×0.8 14.5×102 8.4÷0.21÷0.5 0.8×[(5-0.68)÷1.2].
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(1)10÷0.2÷2.5 =50÷2.5, =20; (2)64×4.5+3.6×45 =6.4×45+3.6×45, =(6.4+3.6)×45, =10×45, =450; (3)1.25×3.2×0.8 =1.25×0.8×3.2, =1×3.2, =3.2; (4)14.5×102 =14.5×(100+2), =14.5×100+14.5×2, =1450+29, =1479; (5)8.4÷0.21÷0.5 =40÷0.5, =80; (6)0.8×[(5-0.68)÷1.2]. =0.8×[4.32÷1.2], =0.8×3.6, =2.88. |
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