7班数学
问题1:求和:
(一)“5/4 + (-11)/ (4)'
答:“5/4 +(-11)/(4)= 4/5 -(11)/ 4”
第5 - 11 = ()/ 4 = 6/4 = 3/2 '
(b)“5/3 + 3/5”
答:“5/3 + 3/5”
' = (25 + 9) / (15) = (34) / (15) '
(c)(9) / (10) + (22) / (15)
答:(9) / (10) + (22) / (15)
' = (-27 + 44) / (30) = (17) / (30) '
(d)(3) / (-11) + 5/9 '
答:(3) / (-11) + 5/9 '
' =(3) /(11) + 5/9”
' = (27 + 55) / (99) = (82) / (99)
(e)(8) / (19) + (2) / (57)
答:(8) / (19) + (2) / (57)
' = (8) / (19) - (2) / (57)
' = (24-2) / (57) = (-26) / (57)
(f)“2/3 + 0”
答:当任何数字加0时，number的值不变。
“2/3 + 0 = 2/3”
(g)“2 \ 1/3 + 4 \ 3/5”
答:' 2 \ 1/3 + 4 \ 3/5 = 7/3 + (23) / (5) '
' = (-35 + 69) / (15) = (34) / (15) '
问题2:找到以下值:
(一)(7) / (24) - (17) / (36)
答:(7) / (24) - (17) / (36)
' =(还是)/ (72)= - (13)/ (72)'
(b)(5) / (63) -621
答:(5) / (63) -621
' = (5 - 39123) / (63) = - (39118) / (63)
(c)(6) /(13) -715的
答:(6) /(13) -715的
' = (6 - 9295) / (13) = (-9301) / (13)
(d)(3) / (8) - (7) / (11)
答:(3) / (8) - (7) / (11)
' = (33-56) / (88) = - (89) / (88)
(e)“2 \ 1/9-6”
答:2 \ 1/9-6 = -(19) /(9) 6’
' = (19-54) / (9) = - (73) / (9) '
问题3:求下列乘积:
(一)“9/2xx (7) / (4) '
答:“9/2xx (7) / (4) = - (63) / (8) '
(b)“(3)/ (10)xx-9”
答:(3) / (10) xx-9 = - (27) / (10) '
(c)“6/5xx(9) /(11)”
答:“6/5xx (9) / (11) = - (54) / (55)
(d)“3/7xx (2) / (5) '
答:“3/7xx (2) / (5) = (6) / (35)
(e)“(3)/ (11)xx2/5”
答:(3) / (11) xx2/5 = (6) / (55)
(f)(3) / (5) xx (5) / (3) '
答:(3) / (5) xx (5) / (3) = 1
问题4:找到以下值:
(一)4÷2/3的
答:4÷2/3的
“= 4 xx3/2 = 6”
(b)“-3/5÷2”
答:“-3/5÷2”
' = 3/5xx1/2 = (3) / (10) '
(c)“-4/5÷(3)'
答:“-4/5÷(3)'
' = 4/5xx (1) / (3) = (4) / (15)
(d)“-1/8÷3/4”
答:“-1/8÷3/4”
“= 1/8xx4/3 = -1/6”
(e)”——(2)/(13)÷1/7”
答:”——(2)/(13)÷1/7”
' = - (2) / (13) xx7/1 = - (14) / (13)
(f)”——(7)/(12)÷(2)/ (13)
答:”——(7)/(12)÷(2)/ (13)
' = - (7) / (12) xx (-13) / (2) = (91) / (24)
(g)(3) /(13)÷(4)/ (65)
答:(3) /(13)÷(4)/ (65)
' = (3) / (13) xx (-65) / (4) = - (15) / (4) '
半岛公司背景