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下面各题怎样简便就怎样算.5÷(7÷11)÷(11÷16)÷(16÷35)28.67×67+3 1 5 ×286.7+5
下面各题怎样简便就怎样算.5÷(7÷11)÷(11÷16)÷(16÷35)28.67×67+315×286.7+573.4×12010×(425+212)-1÷12.5%...
下面各题怎样简便就怎样算.5÷(7÷11)÷(11÷16)÷(16÷35)28.67×67+3 1 5 ×286.7+573.4× 1 20 10×(4 2 5 +2 1 2 )-1÷12.5% 1991+19911991+199119911991+… 2002+20022002+200220022002+… .
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(1)5÷(7÷11)÷(11÷16)÷(16÷35), =5÷
=5×
=25; (2)28.67×67+3
=28.67×67+3.2×286.7+573.4×0.05, =28.67×67+32×28.67+28.67, =(67+32+1)×28.67, =100×28.67, =2867; (3)10×(4
=10×(4.4+2.5)-1÷
=10×6.9-1×
=69-8, =61; (4)
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