怎样简便怎样算312×4+188×4 25×33×4 101×87 4000÷25-13×12 64-(7.2+5.9) (75+240)÷
怎样简便怎样算312×4+188×425×33×4101×874000÷25-13×1264-(7.2+5.9)(75+240)÷(20-5)85.7-(15.3-4.8...
怎样简便怎样算312×4+188×4 25×33×4 101×87 4000÷25-13×12 64-(7.2+5.9) (75+240)÷(20-5) 85.7-(15.3-4.8) 51.27-8.66-1.34 10.75+0.4-9.86.
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(1)312×4+188×4 =(312+188)×4 =500×4 =2000; (2)25×33×4 =25×4×33 =100×33 =3300; (3)101×87 =(100+1)×87 =100×87+1×87 =8787; (4)4000÷25-13×12 =160-156 =4; (5)64-(7.2+5.9) =64-13.1 =50.9; (6)(75+240)÷(20-5) =315÷15 =21; (7)85.7-(15.3-4.8) =85.7-10.5 =75.2; (8)51.27-8.66-1.34 =51.27-(8.66+1.34) =51.27-10 =41.27; (9)10.75+0.4-9.86 =11.15-9.86 =1.29. |
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