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Sixth grade, the second volume of supplementary exercises in mathematics, 62 pages, quick answer! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
1, (180-12) ÷ 4-26 = 42-26 =16 (km)

Let the cargo ship speed be x kilometers per hour, and set the equation.

4x+4×26+ 12= 180

Solve the equation x= 16.

2.5.1× 71%= 3.621(100 million square kilometers)

5.1-3.621=1.479 (100 million square kilometers)

3.621-1.479 = 2.142 (100 million square kilometers)

Method 2: 5.1× 71%-(1-71%)

=5. 1×0.42

= 2. 142 (100 million square kilometers)

3、( 1) (2400 - 1560)÷2400=0.35=35%

(2) 2400× (1-35%) = 2400× 0.65 =1560 (yuan)

(3)1560 ÷ (1-35%) = 2400 (yuan)

Method 2: Set the original price of this TV set as X yuan.

x - 35%x= 1560

x=2400

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