计算下面各题(能简算的要简算).0.85×(21.9-7.6÷4) (15-13.75)×24÷2.5 2.5×44
计算下面各题(能简算的要简算).0.85×(21.9-7.6÷4)(15-13.75)×24÷2.52.5×4412.5×17.8×0.89.9×5.49.4×5.8+1...
计算下面各题(能简算的要简算).0.85×(21.9-7.6÷4) (15-13.75)×24÷2.5 2.5×44 12.5×17.8×0.8 9.9×5.4 9.4×5.8+10.6×5.8.
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(1)0.85×(21.9-7.6÷4), =0.85×(21.9-1.9), =0.85×20, =17; (2)(15-13.75)×24÷2.5, =1.25×24÷2.5, =1.25×8×3÷2.5, =10×3÷2.5, =30÷2.5, =12; (3)2.5×44, =2.5×4×11, =10×11, =110; (4)12.5×17.8×0.8, =12.5×0.8×17.8, =10×17.8, =178; (5)9.9×5.4, =(10-0.1)×5.4, =10×5.4-0.1×5.4, =54-0.54, =53.46; (6)9.4×5.8+10.6×5.8, =(9.4+10.6)×5.8, =20×5.8, =116. |
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