计算下列各题(能简便的要简便)49×49+49 (24×15-290)÷5 271×24-24×171 88×125 32×[168-(89+43
计算下列各题(能简便的要简便)49×49+49(24×15-290)÷5271×24-24×17188×12532×[168-(89+43)]1200÷25101×32....
计算下列各题(能简便的要简便)49×49+49 (24×15-290)÷5 271×24-24×171 88×125 32×[168-(89+43)]1200÷25 101×32.
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(1)49×49+49, =49×(49+1), =49×50, =2450; (2)(24×15-290)÷5, =(24×5×3-290)÷5, =(360-290)÷5, =70÷5, =14; (3)271×24-24×171, =(271-171)×24, =100×24, =2400; (4)88×125, =(8×11)×125, =8×125×11, =1000×11, =11000; (5)32×[168-(89+43)], =32×[168-132], =32×36, =1152; (6)1200÷25, =(1200×4)÷(25×4), =4800÷100, =48; (7)101×32, =(100+1)×32, =100×32+32, =3200+32, =3232. |
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