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va rog imi ziceti,,,,8×7-30:6+9×4......300-2×7+45:9....621-8×(351-342)....900-(42:6+5×9)..

Răspuns :

8×7-30:6+9×4=
56-5+36=
51+36=87

300-2×7+45:9=
300-14+5=
286+5=291

621-8×(351-342)=
621-8×9=
621-72=549

900-(42:6+5×9)=
900-(7+45)=
900-52=848