计算下面各题.(能简算的要简便计算) 7.8×9.8-14.5 13.4+5.62+17.6+4.38 3.6×42+4.2×64 4.
计算下面各题.(能简算的要简便计算)7.8×9.8-14.513.4+5.62+17.6+4.383.6×42+4.2×644.8×12.5×0.81.76-[(0.74...
计算下面各题.(能简算的要简便计算) 7.8×9.8-14.5 13.4+5.62+17.6+4.38 3.6×42+4.2×64 4.8×12.5×0.8 1.76-[(0.74+0.26)÷0.8] (1.89+1.4×3)÷0.25.
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(1)7.8×9.8-14.5, =76.44-14.5, =61.94; (2)13.4+5.62+17.6+4.38, =(13.4+17.6)+(5.62+4.38), =31+10, =41; (3)3.6×42+4.2×64, =36×4.2+4.2×64, =4.2×(36+64), =4.2×100, =420; (4)4.8×12.5×0.8, =4.8×(12.5×0.8), =4.8×10, =48; (5)1.76-[(0.74+0.26)÷0.8], =1.76-[1÷0.8], =1.76-1.25, =0.51; (6)(1.89+1.4×3)÷0.25, =(1.89+4.2)÷0.25, =6.09÷0.25, =24.36. |
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