用递等式计算,能简算的要写出简算过程. (2.5×6+2.5×4)÷5 35.6-2.8+4.4-7.2 0.25×3.2×12.5 7.5÷(1.5+2.5) 0.6×(5+0.6)-1 3.7×1.25-3.7×0.25.
(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), =7.5÷4, =1.875; (5)0.6×(5+0.6)-1, =0.6×5+0.6×0.6-1, =3+0.36-1, =3.36-1, =2.36; (6)3.7×1.25-3.7×0.25, =3.7×(1.25-0.25), =3.7×1, =3.7. |
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