Реши уравнения.48:z+879=887.974-b:7=869.y:2-275=145

48÷z  + 879 = 887 48÷ z  = 887  - 879 48÷z=8 z= 48÷8 z= 6 ---------------------------- 48÷6+879=887 8+879=887 887=887 974 - b÷7=869 b÷7= 974-869 b÷7= 105 b= 105×7 b= 735 --------------------------- 974 - 735÷7=869 974 - 105=869 869=869 y÷2 -275=145 y÷2=145+275 y÷2= 420 y=420×2 y=840 ---------------------------- 840÷2  - 275=145 420-275=145 145=145