a: \(542\cdot7+542\cdot2+542\)

\(=542\left(7+2+1\right)\)

\(=542\cdot10=5420\)

b: \(\left(126\cdot35+157\cdot55\right)\cdot\left(132-6\cdot22\right)\)

\(=\left(126\cdot35+157\cdot55\right)\left(132-132\right)\)

\(=0\cdot\left(126\cdot35+157\cdot55\right)\)

=0

c: \(897\cdot99+897\)

\(=897\left(99+1\right)\)

\(=897\cdot100=89700\)

24/64 + 15/35 = 45/56

35/15 - 25/18 = 17/18

( 0,978 + 126,542) x 3 = 127,52 x 3

                                 =     382,56

12,25 : 2,25 = 5,444444444 = 49/9

24/64 + 15/35 = 45/56

35/15-25/18=17/18

( 0,978+126,542 )x3=382,56

12,25 : 2,25 = 49/9 

( k cho mình đi )

\(x+1=7^{542}.7^{543}\)

\(x+1=7^{1085}\)

\(x=7^{1085}-1\)

nếu mét thì 4250 nha bạn

a)   \(\left(743-569\right)-\left(431-1257+996\right)\)

\(=743-569-431+1257-996\)

\(=\left(743+1257\right)-\left(569+431\right)-996\)

\(=2000-1000-996\)

\(=4\)

a. (2x - 612) + (-303) = 111-x

2x - 612 - 303 = 111 - x

2x - (612+303) = 111 - x

2x - 915 = 111 - x

2x + x = 111 + 915

3x = 1026

x = 1026 : 3

x = 342

vậy_____

\(542+\left(218-x\right)=735\)

\(\Rightarrow\)\(\left(218-x\right)=735-542\)

\(\Rightarrow\)\(218-x=193\)

\(\Rightarrow\)\(x=218-193\)

\(\Rightarrow\)\(x=25\)

\(542+\left(218-x\right)=735.\)

\(218-x=735-542\)

\(218-x=193\)

\(x=218-193\)

\(x=25\)

câu D là 108 ko phải 1084 đâu nha

723×542:1084=361.5

310×11×5:39×24=10492.30769

đáy : \(\dfrac{72+8}{2}=40\left(m\right)\)

chiều cao : \(40-8=32\left(m\right)\\ S=40\times32=1220\left(m^2\right)\)