计算 能用简便方法用简便方法 (1)9.4×[1.28-(1.54-0.31)](2)20-[7.8+(6.2+1.29)](3)0.25×2.
计算能用简便方法用简便方法(1)9.4×[1.28-(1.54-0.31)](2)20-[7.8+(6.2+1.29)](3)0.25×2.73×4(4)799×99....
计算 能用简便方法用简便方法 (1)9.4×[1.28-(1.54-0.31)](2)20-[7.8+(6.2+1.29)](3)0.25×2.73×4(4)799×99.
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(1)9.4×[1.28-(1.54-0.31)], =9.4×[1.28-1.23], =9.4×0.05, =0.47; (2)20-[7.8+(6.2+1.29)], =20-[(7.8+6.2)+1.29], =20-[14+1.29], =20-15.29, =4.71; (3)0.25×2.73×4, =0.25×4×2.73, =1×2.73, =2.73; (4)799×99, =799×(100-1), =799×100-799×1, =79900-799, =79101. |
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