脱式计算,能进行简便运算的要简便.(1)7.6×40.3÷(76×0.8)÷1.25(2) 5 1 5 ÷0.65- 1
脱式计算,能进行简便运算的要简便.(1)7.6×40.3÷(76×0.8)÷1.25(2)515÷0.65-157×0.875(3)(8.6-747)÷267+7.64(...
脱式计算,能进行简便运算的要简便.(1)7.6×40.3÷(76×0.8)÷1.25(2) 5 1 5 ÷0.65- 1 5 7 ×0.875(3)(8.6- 7 4 7 )÷ 2 6 7 +7.64(4)2.4×[ 2 1 3 ÷(2.4× 1 4 15 -3)](5) 456+123×321 123×322+333 +57 1 13 ÷7 .
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(1)7.6×40.3÷(76×0.8)÷1.25, =7.6×40.3÷76÷0.8÷1.25, =7.6÷76÷(0.8×1.25)×40.3, =0.1×40.3, =4.03;
(2) 5 ÷0.65- 1 ×0.875, =5.2÷0.65- × , =8- , = ;
(3)(8.6- 7 )÷ 2 +7.64, =(8 - 7 )÷ 2 +7.64, =( - )× +7.64, = × - × +7.64, = - +7.64, =3.01-2.65+7.64, =0.36+7.64, =8;
(4)2.4×[ 2 ÷(2.4× 1 -3)], =2.4×[ 2 ÷( -3)], =2.4×[ 2 ÷ ], = × ×25, =140;
(5) +57 ÷7 , = 456+123×321 | 123×(321+1)+333 | +57 ÷7, = 456+123×321 | 123×321+123×1+333 | +57 ÷7, = 456+123×321 | 123×321+123+333 | +57 ÷7, = +57 ÷7, =1+57 ÷7, =1+ × , =1+ = . |
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