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Calculează
42:7x8+3x3x2-15x5x9-72:8:9=
4x10:5+64:8x9-63:7x5x54:9x6=
100(32x4:7+24:4x2)12:4x9=
28:4x10-63:(63:9x6-21:3x5)x3=
35:5x7+8x(36:9x7-30:5x4)-63:7=


Răspuns :

42:7x8+3x3x2-15x5x9-72:8:9=
6x8+9x2-75x9-9:9=
48+18-675-1=66-675-1=-610

4x10:5+64:8x9-63:7x5x54:9x6=

40:5+8x9-9x5x54:9x6=
8+72-45x54:9x6=
8+72-2430:9x6=
8+72-270x6=8+72-1620=80-1620=-1540

100x(32x4:8+24:4x2)x12:4x9=

100x(128:8+6x2)x12:4x9=
100x(16+12)x12:4x9=
100x28x12:4x9=2800x12:4x9=33600:4x9=8400x9=75600

28:4x10-63:(63:9x6-21:3x5)x3=

7x10-63:(7x6-7x5)x3=70-63:(42-35)x3=
70-63:7x3=
70-9x3=70-27=43

35:5x7+8x(36:9x7-30:5x4)-63:7=7
x7+8x(4x7-6x4)-9=49+8x(28-24)-9=49+8x4-9=49+32-9=81-9=72