Toán Lớp 4: Y×12+y×89-y=42100 326×y-y-225×y=567

Question

Toán Lớp 4:  Y×12+y×89-y=42100 326×y-y-225×y=567

phuongthuydung · Answer

y xx 12 + y xx 89 - y = 42100     y xx 12 + y xx 89 - y xx 1 = 42100     y xx (12 + 89 - 1) = 42100     y xx 100 = 42100     y = 42100 : 100     y = 421     Vậy y = 421     ________________________________________________     326 xx y - y - 225 xx y = 567     326 xx y - y xx 1 - 225 xx y = 567     y xx (326 - 1 - 225) = 567     y xx 100 = 567     y = 567 : 100     y = 5,67     Vậy y = 5,67

ngochuong2k2 · Answer

a, Y &times; 12 + y &times; 89 - y = 42100         y &times; 12 + y &times; 89 - y &times; 1 = 42100         y &times; ( 12 + 89 - 1 ) = 42100         y &times; 100 = 42100         y = 42100 : 100         y = 421     b, 326 &times; y - y -225 &times; y = 567         326 &times; y -y &times; 1 - 225 &times; y = 567         y &times; ( 326 - 1 - 225 ) = 567         y &times; 100 = 567         y = 567 : 100         y = 5,67