用递等式计算.(能简算的要写出简算过程) (1)1.25×3.2×0.25 (2)6.4×0.27+3.6×0.27 (3
用递等式计算.(能简算的要写出简算过程)(1)1.25×3.2×0.25(2)6.4×0.27+3.6×0.27(3)3.84-0.84×5÷1.5(4)2.5×0.99...
用递等式计算.(能简算的要写出简算过程) (1)1.25×3.2×0.25 (2)6.4×0.27+3.6×0.27 (3)3.84-0.84×5÷1.5 (4)2.5×0.99 (5)8.19+0.5×(4.36-2.74) (6)1.8×2.48+1.52×1.8-0.5 (7)[(6-4.2)×2.5]÷2.5×1 (8)4.02÷[(1-0.4)÷0.1].
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(1)1.25×3.2×0.25, =1.25×8×0.4×0.25, =(1.25×8)×(0.4×0.25), =10×0.1, =1; (2)6.4×0.27+3.6×0.27, =(6.4+3.6)×0.27, =10×0.27, =2.7; (3)3.84-0.84×5÷1.5, =3.84-4.2÷1.5, =3.84-2.8, =1.04; (4)2.5×0.99, =2.5×(1-0.01), =2.5×1-2.5×0.01, =2.5-0.025, =2.475; (5)8.19+0.5×(4.36-2.74), =8.19+0.5×1.62, =8.19+0.81, =9; (6)1.8×2.48+1.52×1.8-0.5, =1.8×(2.48+1.52)-0.5, =1.8×4-0.5, =7.2-0.5, =6.8; (7)[(6-4.2)×2.5]÷2.5×1, =[1.8×2.5]÷2.5×1, =1.8×(2.5÷2.5)×1, =1.8×1×1, =1.8; (8)4.02÷[(1-0.4)÷0.1], =4.02÷[0.6÷0.1], =4.02÷6, =0.67. |
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