计算下面各题,能简便的用简单运算(1)27×86+86×73 (2)20...
计算下面各题,能简便的用简单运算(1)27×86+86×73(2)201-(960+627)÷23(3)(250-72)×20(4)199×49+49(5)76×125(...
计算下面各题,能简便的用简单运算(1)27×86+86×73 (2)201-(960+627)÷23(3)(250-72)×20 (4)199×49+49(5)76×125 (6)25×[480-÷16].
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(1)27×86+86×73, =(27+73)×86, =100×86, =8600; (2)201-(960+627)÷23, =201-1587÷23, =201-69, =132; (3)(250-72)×20, =178×20, =3560; (4)199×49+49, =(199+1)×49, =200×49, =9800; (5)76×125, =(80-4)×125, =80×125-4×125, =10000-500, =9500; (6)25×[480-÷16], =25×[480-896÷16], =25×[480-56], =25×424, =10600. |
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