用递等式计算,能简算的要简算.135÷27+12×4 1620-1320÷60+80 (85+14×5)÷5 520÷[13×(43-33)]
用递等式计算,能简算的要简算.135÷27+12×41620-1320÷60+80(85+14×5)÷5520÷[13×(43-33)]490÷[210÷(360÷12)...
用递等式计算,能简算的要简算.135÷27+12×4 1620-1320÷60+80 (85+14×5)÷5 520÷[13×(43-33)] 490÷[210÷(360÷12)] [160-(75+38)]×107 45+61+39+55 25×5×4×2 125×(8×5)×7.
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(1)135÷27+12×4, =5+48, =53; (2)1620-1320÷60+80, =1620-22+80, =1598+80, =1678; (3)(85+14×5)÷5, =(85+70)÷5, =155÷5, =31; (4)520÷[13×(43-33)], =520÷[13×10], =520÷130, =4; (5)490÷[210÷(360÷12)], =490÷[210÷30], =490÷7, =70; (6)[160-(75+38)]×107, =[160-113]×107, =47×107, =5029; (7)45+61+39+55, =(45+55)+(61+39), =100+100, =200; (8)25×5×4×2, =(25×4)×(5×2), =100×10, =1000; (9)125×(8×5)×7, =(125×8)×(5×7), =1000×35, =35000. |
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