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| (1)569+68+132+31, =(569+31)+(68+132), =600+200, =800; (2)38×25×4, =38×(25×4), =38×100, =3800; (3)2300-165-35, =2300-(165+35), =2300-200, =2100; (4)125×(8+4), =125×8+125×4, =1000+500, =1500; (5)3200÷25÷4, =3200÷(25×4), =3200÷100, =32; (6)23×32+68×23, =23×(32+68), =23×100, =2300; (7)25×204, =25×(200+4), =25×200+25×4, =5000+100, =5100; (8)56×32-46×32, =(56-46)×32, =10×32, =320. |
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